JP2020530529A - Aluminum alloy products with selectively recrystallized microstructure and manufacturing methods - Google Patents

Abstract

The present disclosure generally provides an aluminum alloy product having a microstructure selectively recrystallized on one or more surfaces of the product. The disclosure also provides manufactured articles made from such products, as well as methods of making such products, such as through casting and rolling. The disclosure also provides various end applications for such products, such as in automotive, transportation, electronics, and industrial applications. [Selection diagram] Fig. 1

Description

Cross-reference to related applications This application claims the interests and priority of US Provisional Patent Application No. 62 / 548,013 filed on August 21, 2017, which is incorporated herein by reference in its entirety. Is done.

The present disclosure generally provides aluminum alloy products having a recrystallized microstructure selectively on the surface of the product. The disclosure also provides manufactured articles made from aluminum alloy products, as well as methods of making aluminum alloy products, such as through casting and rolling. The disclosure also provides various end applications for such products, such as in automotive, transportation, electronics, and industrial applications.

Aluminum alloy products are desirable for use in a number of different applications, especially those where light weight, strength, and durability are required. For example, aluminum alloys are increasingly replacing steel as a structural component of automobiles and other transportation equipment. Since aluminum alloys are generally about 2.8 times less dense than steel, the use of such materials reduces the weight of the equipment and allows for substantial improvements in fuel economy. Nevertheless, the use of aluminum alloy products can pose specific challenges.

One particular challenge relates to the tendency of aluminum alloy products to recrystallize during and after a particular processing step. In metallurgy, recrystallization is a defect in which deformed grains (formed, for example, as a result of rolling or other mechanical forming activities) reorient and nucleate the deformed grains to gradually replace them. Refers to the process of converting to grain without grains. Recrystallization generally improves the ductility of the material, but generally at the expense of strength and hardness. Therefore, in applications where strength and hardness are important, such as certain applications where aluminum alloys can be used to replace steel, recrystallization can limit the use of certain aluminum alloys as a substitute for steel.

The contained embodiments of the present disclosure are defined by the claims, not by this overview. This overview provides a high-level overview of the various aspects of the invention and introduces some of the concepts further described in the "Detailed Description" section below. The outline of the present invention is not intended to identify the important or essential features of the claimed subject matter, but is also intended to be used alone to determine the scope of the claimed subject matter. Not done. The subject matter should be understood by reference to the entire specification, any or all drawings, and the appropriate portion of each claim.

The present disclosure refers to surface portions where the higher portion of the aluminum alloy material has a higher degree of recrystallization or recrystallization ratio than the inner portion of the article, which has a microstructure that has not been restored and / or recrystallized. To provide a novel aluminum alloy article having. Although the aluminum alloy articles of the present disclosure are made from monolithic aluminum alloy materials, they have certain benefits of the clad aluminum alloy material, such as the strength of the core of the article and the ductility of the clad of the article. The present disclosure also provides a method of making such an aluminum alloy article, and a manufactured article formed from such an aluminum alloy article. In some examples, the aluminum alloy article is a rolled article such as an aluminum alloy sheet, the material near the surface of the sheet has a recrystallized microstructure, and the material inside the sheet recovers and / or recrystallizes. It has an uncrystallized microstructure. The resulting article, combined with the desired bendability and corrosive properties of the material in the recrystallized ultrastructure, exhibits the benefit of the strength of the material in the recrystallized and / or uncrystallized ultrastructure.

The present disclosure is composed of an aluminum alloy material, (a) a first surface portion, (b) a second surface portion facing the first surface portion, and (c) a first surface portion and a second. An aluminum alloy article is provided that further comprises an intermediate portion between the surface portion, the first surface portion and the second surface portion include a rolled surface, and the aluminum alloy of the first surface portion and the second surface portion. The material has a higher degree of recrystallization or recrystallization rate than the aluminum alloy material in the middle part. In some embodiments, the aluminum alloy article is an ingot, strip, shade, slab, billet, or other aluminum alloy product. In some other embodiments, the aluminum alloy article is a rolled aluminum alloy article and is formed, for example, by a process involving rolling the aluminum alloy article until the desired thickness is achieved. In some embodiments, the rolled aluminum alloy article is prepared in any suitable tempering, eg, O tempering or T1 to T9 tempering range, and aluminum alloy sheets, shades, in any suitable gauge. It is a plate, extruded product, cast product, or forged product. In some embodiments, the aluminum alloy article is made from a 7xxx series alloy as provided herein.

The present disclosure also provides a method for producing an aluminum alloy article, the method of which is to prepare an aluminum alloy, wherein the aluminum alloy is prepared as a molten aluminum alloy in a molten state, the preparation and the molten aluminum. The alloy is cast to form an aluminum alloy cast product, the aluminum alloy cast product is homogenized to form a homogenized aluminum alloy cast product, and the homogenized aluminum alloy cast product is rolled to form the first Is to form a first rolled aluminum alloy product having a thickness of one or more, the rolling of which includes one or more hot rolling passes and one or more cold rolling passes. Forming, where the pass precedes one or more cold-rolled passes, and a first tanning of the first rolled aluminum alloy product at a temperature above 50 ° C. above the minimum recrystallization temperature of the aluminum alloy. It includes forming an aluminum product and rolling a first annealed aluminum alloy product to form a second rolled aluminum product having a second thickness. In some embodiments, the aluminum alloy article is subjected to a final solution heat treatment, for example, the article can be solution heat treated either through either a CASH (continuous annealing and solution heat treatment) or a hot stamping process.

The disclosure also provides aluminum alloy articles made by the processes disclosed herein.

Manufactured articles, including the disclosed aluminum alloy articles, are also disclosed. In some embodiments, the manufactured product comprises a rolled aluminum alloy article. Examples of such manufactured goods are automobiles, trucks, trailers, trains, railroad vehicles, aircraft components such as body panels, or other parts, bridges, pipelines, pipes, tubes for any of the aforementioned. , Boats, ships, storage containers, storage tanks, furniture, windows, doors, railings, functional or decorative building parts, pipe railings, electrical components, conduits, beverage containers, food containers, or foils. , Not limited to these. In some embodiments, the manufactured article is a vehicle body component for automobiles or transportation and is a power vehicle body component (eg, bumper, side beam, roof beam, cross beam, pillar reinforcement, inner panel, outer panel, side). Includes panels, hood inners, hood outers, and trunk lid panels). Manufactured articles may also include housings for aerospace products and electronic devices.

Additional embodiments and embodiments are described in the detailed description, claims, non-limiting examples, and drawings contained herein.

Although this specification refers to the accompanying drawings below, the use of similar reference numbers in different drawings is intended to illustrate similar or similar components.

It is a schematic diagram which shows the preparation process of an aluminum alloy article. FIG. 3 is an optical micrograph (OM) of alloy A1 showing microstructures that have been lab rolled and processed and have not recovered and / or recrystallized throughout the thickness of the sample. FIG. 3 is an optical micrograph (OM) of alloy A1 plant-rolled using intermediate annealing. It is an image which shows the surface part from FIG. 3A which shows the recrystallization fine structure. Nine black-and-white reduced images of FIG. 3B highlighting the various colors shown in FIG. 3B that may reveal specific features. FIG. 5 is an image showing the central portion from FIG. 3A showing a fine structure that has not been recovered and / or recrystallized. Nine black and white reduced images of FIG. 3D highlighting the various colors shown in FIG. 3D that may reveal specific features. For example, the image of FIG. 3E shows significant horizon corresponding to restored and / or uncrystallized microstructures with various crystal orientations. Most of the horizontal structures are not seen in the surface portions shown in FIGS. 3B and 3C, and the surface portions show a significantly recrystallized microstructure. FIG. 3 is an optical micrograph of alloy A5 plant-rolled during the cold rolling process without intermediate annealing. FIG. 5 is an image showing a surface portion from FIG. 4A showing a recrystallized microstructure. FIG. 5 is an image showing a central portion from FIG. 4A showing a fine structure that has not been recovered and / or recrystallized. The cross section of the aluminum alloy sheet recorded by EBSD is shown in the image shown on the right side of FIGS. 5A, 5B, and 5C, and the aluminum alloy sheet of alloy A1 is rolled in the final gauge and completed with T6 tempering. To do. The low-angle boundaries (2-15 °) are marked as darker horizontal lines (shown separately in black in the upper left image of FIGS. 5A-5C), while the medium to high-angle boundaries (> 15). °) Is marked as a lighter colored horizontal line (shown separately in black in the lower left image of FIGS. 5A-5C). Image of alloy A1 lab-processed during the cold rolling process without intermediate annealing, having a uniform microstructure that has not recovered and / or recrystallized throughout its thickness, while An image of alloy A1 plant-processed using intermediate annealing during the cold rolling process to show the recrystallized microstructure near the surface and the recovered and / or uncrystallized microstructure in the center. Shown. FIG. 5 is an image showing alloy A5 plant-processed during a cold rolling process without intermediate annealing, having a microstructure between those shown in FIGS. 5A and 5B. It is a graph which shows the bendability test result of a specific aluminum alloy article, and bendability is tested in the longitudinal direction and the transverse direction (with respect to a rolling direction). It is a photograph of an aluminum alloy sheet after a peel corrosion test. It is a photograph of an aluminum alloy sheet after a peel corrosion test. It is a photograph of an aluminum alloy sheet after a peel corrosion test. It is a photograph of an aluminum alloy sheet after a peel corrosion test. It is a photograph of an aluminum alloy sheet after a peel corrosion test. It is a graph which shows the result of the yield strength test of a series of aluminum alloy sheets.

The present disclosure provides an aluminum alloy article showing a novel combination of recrystallized microstructures and recovered and / or unrecrystallized microstructures, and methods of making such articles. These articles can exhibit increased strength over articles made from fully recrystallized materials, while retaining the bendability and corrosion resistance typically possessed by such materials.
Definition and description:

As used herein, the terms "invention," "the invention," "this invention," and "the present invention" are the scope of the claims and claims below. It is intended to make a broad reference to all of the subjects of. It should be understood that the description containing these terms does not limit the subject matter described herein, or the meaning or scope of the following claims.

As used herein, alloys identified by AA number and other related designations such as "series" or "7xxx" are referenced. Regarding the understanding of the numbering system most commonly used for naming and identifying aluminum and its alloys, both are published by The Aluminum Association, "International Alloy Designs and Chemical Corporation Limits for Aluminum Aluminum Aluminum". Or "Registration Record of Aluminum Alloy Designs and Chemical Compositions Limits for Aluminum Alloys in the Form of Casting." Or "Registration Record of Aluminum Alloys in the Form of Casting."

As used herein, the plate generally has a thickness greater than about 15 mm. For example, the plate is greater than about 15 mm, greater than about 20 mm, greater than about 25 mm, greater than about 30 mm, greater than about 35 mm, greater than about 40 mm, greater than about 45 mm, greater than about 50 mm, or greater than about 100 mm. It may refer to an aluminum product having a thickness.

As used herein, the shade (also referred to as the sheet plate) generally has a thickness of about 4 mm to about 15 mm. For example, the shade may have a thickness of about 4 mm, about 5 mm, about 6 mm, about 7 mm, about 8 mm, about 9 mm, about 10 mm, about 11 mm, about 12 mm, about 13 mm, about 14 mm, or about 15 mm. ..

As used herein, sheet generally refers to an aluminum product with a thickness of less than about 4 mm. For example, the sheet may have a thickness of less than about 4 mm, less than about 3 mm, less than about 2 mm, less than about 1 mm, less than about 0.5 mm, or less than about 0.3 mm (eg, about 0.2 mm). ..

As used herein, the term slab refers to alloy thicknesses in the range of 5 mm to 50 mm. For example, the slab can have a thickness of about 5 mm, about 10 mm, about 15 mm, about 20 mm, about 25 mm, about 30 mm, about 35 mm, about 40 mm, about 45 mm, or about 50 mm.

In this application, the tempering or condition of the alloy may be referred to. See "American National Standards (ANSI) H35 on Alloy and Temper Designation Systems" for an understanding of the most commonly used alloy tempering descriptions. F-state or temper refers to the as-manufactured aluminum alloy. The O state or tempering refers to an aluminum alloy after annealing. The Hxx state or temper, also referred to herein as H temper, refers to a non-heat treatable aluminum alloy after cold rolling with or without heat treatment (eg, annealing). Suitable H tempering degrees include HX1, HX2, HX3, HX4, HX5, HX6, HX7, HX8, or HX9 tempering degrees. T1 state or tempering refers to an aluminum alloy that has been cooled from hot working and naturally aged (eg, at room temperature). T2 state or tempering refers to an aluminum alloy that has been cooled from hot working, cold working and naturally aged. T3 state or tempering refers to an aluminum alloy that has been solution treated, cold processed and naturally aged. T4 state or tempering refers to an aluminum alloy that has been solution treated and naturally aged. T5 state or tempering refers to an aluminum alloy that has been cooled from hot working and artificially aged (at high temperature). T6 state or tempering refers to an aluminum alloy that has been solution treated and artificially aged. T7 state or tempering refers to an aluminum alloy that has been solution treated and artificially overaged. T8x state or tempering refers to an aluminum alloy that has been solution treated, cold worked and artificially aged. T9 state or tempering refers to an aluminum alloy that has been solution treated, artificially aged, and cold worked. The W state or tempering degree refers to an aluminum alloy after solution heat treatment.

As used herein, terms such as "cast metal products," "cast products," "cast aluminum alloy products," are interchangeable, direct chill casting (including direct chill co-casting) or semi-continuous. Casting, continuous casting (including using, for example, twin belt casting machines, twin roll casting machines, block casting machines, or any other continuous casting machine), electromagnetic casting, hot top casting, or any other casting. Refers to a product manufactured by a method.

As used herein, "room temperature" means about 15 ° C to about 30 ° C, eg, about 15 ° C, about 16 ° C, about 17 ° C, about 18 ° C, about 19 ° C, about 20 ° C, It may include temperatures of about 21 ° C, about 22 ° C, about 23 ° C, about 24 ° C, about 25 ° C, about 26 ° C, about 27 ° C, about 28 ° C, about 29 ° C, or about 30 ° C. As used herein, the meaning of "ambient conditions" can include temperatures at about room temperature, relative humidity from about 20% to about 100%, and atmospheric pressure from about 975 mbar (mbar) to about 1050 mbar. For example, the relative humidity is about 20%, about 21%, about 22%, about 23%, about 24%, about 25%, about 26%, about 27%, about 28%, about 29%, about 30%, About 31%, about 32%, about 33%, about 34%, about 35%, about 36%, about 37%, about 38%, about 39%, about 40%, about 41%, about 42%, about 43 %, About 44%, About 45%, About 46%, About 47%, About 48%, About 49%, About 50%, About 51%, About 52%, About 53%, About 54%, About 55%, About 56%, about 57%, about 58%, about 59%, about 60%, about 61%, about 62%, about 63%, about 64%, about 65%, about 66%, about 67%, about 68 %, About 69%, About 70%, About 71%, About 72%, About 73%, About 74%, About 75%, About 76%, About 77%, About 78%, About 79%, About 80%, About 81%, about 82%, about 83%, about 84%, about 85%, about 86%, about 87%, about 88%, about 89%, about 90%, about 91%, about 92%, about 93 %, About 94%, about 95%, about 96%, about 97%, about 98%, about 99%, about 100%, or somewhere in between. For example, the atmospheric pressure is about 975 mbar, about 980 mbar, about 985 mbar, about 990 mbar, about 995 mbar, about 1000 mbar, about 1005 mbar, about 1010 mbar, about 1015 mbar, about 1020 mbar, about 1025 mbar, about 1030 mbar, about 1035 mbar, about 1035 mbar It can be at about 1050 atm, or between them.

All scopes disclosed herein are understood to include any and all subranges contained therein. For example, the range described as "1-10" is an arbitrary and all subrange between the minimum value of 1 and the maximum value of 10, that is, from a minimum value of 1 or more, for example, 1 to 6.1. It must be considered to include all subranges starting and all subranges ending with a maximum of 10 or less, for example 5.5-10. Unless otherwise stated, the expression "to" when referring to the composition of an element means that the element is optional and includes a zero percent composition of that particular element. Unless otherwise stated, all composition percentages are weight percent (% by weight).

As used herein, the meanings of "one (a)", "one (an)", or "the" are singular and plural, unless explicitly stated otherwise in the context. Including references.

In the examples below, aluminum alloy products and their components are described in weight percent (% by weight) with respect to their elemental composition. In each alloy, the balance is aluminum and the maximum% by weight of the total impurities is 0.15% by weight.

Accidental elements such as grain micronizing agents and deoxidizers, or other additives may be present in the present invention and deviate from the properties of the alloys described herein or the alloys described herein. Other properties may be added on their own without or without significant changes.

Due to the unique properties of aluminum or leaching from contact with processing equipment, unavoidable impurities, including materials or elements, may be present in the alloy in small amounts. Some impurities typically found in aluminum include iron and silicon. As described, the alloy may contain any element of about 0.25% by weight or less, in addition to alloying elements, accidental elements, and unavoidable impurities.
Aluminum alloy articles

In at least one embodiment, the present disclosure comprises an aluminum alloy material with a first surface portion, a second surface portion facing the first surface portion, and a first surface portion and a second surface portion. Provided is an aluminum alloy article having an intermediate portion between, and the aluminum alloy material of the first surface portion and the second surface portion has a higher degree of recrystallization or recrystallization ratio than the aluminum alloy material of the intermediate portion. .. In some embodiments thereof, the first surface portion and the second surface portion each include a rolled surface.

The aluminum alloy article may include any suitable aluminum alloy material in the range of 1XXX series aluminum alloys to 8XXX series aluminum alloys. In some embodiments, the aluminum alloy material is a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy. In some embodiments, the aluminum alloy material is 7xxx containing, for example, 0.01% to 0.50% by weight of zirconium (Zr), among other standard elements, based on the total elemental composition of the alloy. It is a series of aluminum alloys.

In some embodiments where the aluminum alloy material is a 7xxx series aluminum alloy, the aluminum alloy material can be selected from any suitable 7xxx series aluminum alloys, the following 7xxx series aluminum alloys, AA7011, AA7019, AA7020. , AA7021, AA7039, AA7072, AA7075, A7085, AA7108, AA7108A, AA7015, AA7017, AA7018, AA7019A, AA7024, AA7025, AA7028, AA7030, AA7031, AA7033, AA7035, AA700A, AA703, AA703, AA , AA7010, AA7011, AA7012, AA7014, AA7016, AA7116, AA7122, AA7023, AA7026, AA7029, AA7129, AA7229, AA7032, AA7033, AA7034, AA7036, AA7133, AA7037, AA7036, AA70136, AA7037, AA70 , AA7249, AA7349, AA7449, AA7050, AA750A, AA7150, AA7250, AA7055, AA7155, AA7255, AA7056, AA7060, AA7064, AA7065, AA7068, AA7168, AA7175, AA7175, AA7168, AA7175, AA7175, AA71A , AA7090, AA7093, AA7095, and AA7099, but are not limited thereto.

In some embodiments, the aluminum alloy material has the elemental compositions listed in Table 1.

In some embodiments, the aluminum alloy material has the elemental compositions listed in Table 2.

The aluminum alloy material is optionally 4% to 15% (eg, 5.4% to 9.5%, 5.6% to 9.3%, 5.8% to 9) based on the total weight of the alloy. It contains zinc (Zn) in an amount of .2%, or 4.0% to 5.0%). For example, aluminum alloy materials are 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8. % 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8 % 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8 %, 6.9%, 7.0%, 7.1%, 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8 %, 7.9%, 8.0%, 8.1%, 8.2%, 8.3%, 8.4%, 8.5%, 8.6%, 8.7%, 8.8 %, 8.9%, 9.0%, 9.1%, 9.2%, 9.3%, 9.4%, 9.5%, 9.6%, 9.7%, 9.8 %, 9.9%, 10.0%, 10.1%, 10.2%, 10.3%, 10.4%, 10.5%, 10.6%, 10.7%, 10.8 % 10.9%, 11.0%, 11.1%, 11.2%, 11.3%, 11.4%, 11.5%, 11.6%, 11.7%, 11.8 %, 11.9%, 12.0%, 12.1%, 12.2%, 12.3%, 12.4%, 12.5%, 12.6%, 12.7%, 12.8 %, 12.9%, 13.0%, 13.1%, 13.2%, 13.3%, 13.4%, 13.5%, 13.6%, 13.7%, 13.8 %, 13.9%, 14.0%, 14.1%, 14.2%, 14.3%, 14.4%, 14.5%, 14.6%, 14.7%, 14.8. May contain%, 14.9%, or 15.0% Zn. All are expressed in% by weight.

The aluminum alloy material is optionally 0.1% to 3.5% (eg, 0.2% to 2.6%, 0.3% to 2.5%, or 0) based on the total weight of the alloy. Includes copper (Cu) in an amount of .15% to 0.6%). For example, aluminum alloy materials are 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18. %, 0.19%, 0.20%, 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28 %, 0.29%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70 %, 0.75%, 0.80%, 0.85%, 0.90%, 0.95%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4 %, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4 %, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4 May contain%, or 3.5% Cu. All are expressed in% by weight.

The aluminum alloy material is optionally 1.0% to 4.0% (eg, 1.0% to 3.0%, 1.4% to 2.8%, or 1.6% to 2.6%). ) Contains magnesium (Mg). For example, aluminum alloy materials are 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8. % 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8 % 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8 May contain%, 3.9%, or 4.0% Mg. All are expressed in% by weight.

The aluminum alloy material is optionally 5% to 14% (eg, 5.5% to 13.5%, 6% to 13%, 6.5% to 12.5%, or 7% to 12%). Includes a mixed content of Zn, Cu, and Mg in the range. For example, the mixed content of Zn, Cu, and Mg is 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, 7.5%, 8.0%, 8 5.5%, 9.0%, 9.5%, 10.0%, 10.5%, 11.0%, 11.5%, 12.0%, 12.5%, 13.0%, 13 It can be 5.5%, or 14.0%. All are expressed in% by weight.

The aluminum alloy material is optionally of 0.05% to 0.50% (eg, 0.10% to 0.35%, or 0.10% to 0.25%) based on the total weight of the alloy. Contains iron (Fe) in quantity. For example, aluminum alloy materials are 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%, 0.11%, 0.12%, 0.13. %, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.20%, 0.21%, 0.22%, 0.23 %, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.30%, 0.31%, 0.32%, 0.33 %, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39%, 0.40%, 0.41%, 0.42%, 0.43 %, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, or 0.50% Fe may be contained. All are expressed in% by weight.

The aluminum alloy material is optionally of 0.05% to 0.30% (eg, 0.05% to 0.25%, or 0.07% to 0.15%) based on the total weight of the alloy. Contains silicon (Si) in quantity. For example, aluminum alloy materials are 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%, 0.11%, 0.12%, 0.13. %, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.20%, 0.21%, 0.22%, 0.23 It may contain%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, or 0.30% Si. All are expressed in% by weight.

The aluminum alloy material is optionally 0.01% to 0.50% (eg, 0.05% to 0.25%, or 0.05% to 0.20%, or, based on the total weight of the alloy. Contains zirconium (Zr) in an amount (0.09% to 0.15%). For example, aluminum alloy materials are 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09. %, 0.10%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19 %, 0.20%, 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29 %, 0.30%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39 %, 0.40%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49 %, 0.50% Zr may be included. In another example, the alloy contains less than 0.05% (eg, 0.04%, 0.03%, 0.02%, or 0.01%) of Zr based on the total weight of the alloy. Can include. All are expressed in% by weight.

In some cases, the presence of Zr in the alloy can form an Al ₃ Zr dispersoid that can help fix the grain boundaries of the aluminum alloy material. In the area of aluminum alloy articles near the rolled surface, the higher strain introduced from the rolling process can at least partially overcome immobilization, allowing for higher recrystallization or recrystallization ratio. .. On the other hand, in the inner part of the aluminum alloy article, immobilization is not overcome and a much lower degree of recrystallization occurs. In some embodiments, the Al ₃ Zr dispersoid is present in the aluminum alloy material and the dispersoid has a number average diameter in the range of 1 nm to 20 nm.

The aluminum alloy material optionally contains manganese (eg, 0.01% to 0.10%, or 0.02% to 0.05%) in an amount of up to 0.25% (eg, 0.01% to 0.10%, or 0.02% to 0.05%) based on the total weight of the alloy. Mn) is included. For example, aluminum alloy materials are 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09. %, 0.10%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19 %, 0.20%, 0.21%, 0.22%, 0.23%, 0.24%, or 0.25% Mn. In some cases, Mn is absent in the alloy (ie, 0%). All are expressed in% by weight.

The aluminum alloy material is optionally based on the total weight of the alloy, up to 0.20% or up to 0.10% (eg, 0.01% to 0.10%, 0.01% to 0.05%, Or contains chromium (Cr) in an amount of 0.03% to 0.05%). For example, aluminum alloy materials are 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09. %, 0.10%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19 May contain%, or 0.20% Cr. In some cases, Cr is absent in the alloy (ie 0%). All are expressed in% by weight.

The aluminum alloy material can optionally be up to 0.15% (eg, 0.001% to 0.10%, 0.001% to 0.05%, or 0.003% to) based on the total weight of the alloy. Contains titanium (Ti) in an amount of 0.035%). For example, the alloys are 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.010%, 0.011%, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.020%, 0.021%, 0.022%, 0.023%, 0.024%, 0.025%, 0.026%, 0.027%, 0.028%, 0.029%, 0.030%, 0.031%, 0.032%, 0.033%, 0.034%, 0.035%, 0.036%, 0.037%, 0.038%, 0.039%, 0.040%, 0.041%, 0.042%, 0.043%, 0.044%, 0.045%, 0.046%, 0.047%, 0.048%, 0.049%, 0.050%, 0.055%, 0.060%, 0.065%, 0.070%, 0.075%, 0.080%, 0.085%, 0.090%, 0.095%, It may contain 0.100%, 0.110%, 0.120%, 0.130%, 0.140%, or 0.150% Ti. In some cases, Ti is absent in the alloy (ie 0%). All are expressed in% by weight.

The aluminum alloy material can optionally be up to 0.10% (eg, 0.01% to 0.10%, 0.01% to 0.05%, or 0.03% to) based on the total weight of the alloy. One or more selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu in an amount of 0.05%). Contains the elements of. For example, aluminum alloy materials are 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09. % Or 0.10% Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and one or more selected from the group consisting of Lu. May contain the elements of. All are expressed in% by weight.

The aluminum alloy material can optionally be up to 0.10% (eg, 0.01% to 0.10%, 0.01% to 0.05%, or 0.03% to 0.03%, based on the total weight of the alloy. Contains one or more elements selected from the group consisting of Mo, Nb, Be, B, Co, Sn, Sr, V, In, Hf, Ag, Sc, and Ni in an amount (0.05%). For example, aluminum alloy materials are 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09. It may contain one or more elements selected from the group consisting of%, or 0.10% Mo, Nb, Be, B, Co, Sn, Sr, V, In, Hf, Ag, Sc, and Ni. All are expressed in% by weight.

The aluminum alloy material is optionally 0.15% or less, 0.14% or less, 0.13% or less, 0.12% or less, 0.11% or less, 0.10% or less, 0.09% or less, Amounts of 0.08% or less, 0.07% or less, 0.06% or less, 0.05% or less, 0.04% or less, 0.03% or less, 0.02% or less, or 0.01% or less It contains a small amount of other elements, sometimes referred to as impurities. In some embodiments, these impurities include, but are not limited to, Ga, Ca, Bi, Na, Pb, or combinations thereof. Therefore, in some embodiments, one or more elements selected from the group consisting of Ga, Ca, Bi, Na, and Pb are 0.15% or less, 0.14% or less in the aluminum alloy material. , 0.13% or less, 0.12% or less, 0.11% or less, 0.10% or less, 0.09% or less, 0.08% or less, 0.07% or less, 0.06% or less, 0 It can be present in an amount of 0.05% or less, 0.04% or less, 0.03% or less, 0.02% or less, or 0.01% or less. The sum of all impurities does not exceed 0.15% (eg 0.10%). All are expressed in% by weight. The remaining percentage of the alloy is aluminum.

The alloy compositions disclosed herein, including any of the aluminum alloy materials of the aforementioned embodiments, have aluminum (Al) as the main component, eg, in an amount of at least 85.0% of the alloy. The alloy composition is optionally at least 85.5% Al, or at least 86.0% Al, or at least 86.5% Al, or at least 87.0% Al, or at least 87.5% Al. Al, or at least 88.0% Al, or at least 88.5% Al, or at least 89.0% Al, or at least 89.5% Al, or at least 90.0% Al, or at least 90. It has .5% Al, or at least 91.0% Al, or at least 91.5% Al, or at least 92.0% Al. All are expressed in% by weight.

The aluminum alloy articles disclosed herein can be any suitable aluminum alloy articles. As mentioned above, the article has a first surface portion and an opposite second surface portion. In some cases, the surface of the first surface portion and the surface of the second surface portion may be parallel or nearly parallel to each other, or may be located apart from each other, or perpendicular to the two surfaces. It is present on the opposite surface of the article so that it can be separated by a thickness that can represent the distance between the two surfaces along the line or the shortest distance between the two surfaces, eg, a first thickness.

As mentioned above, in some embodiments, the first surface portion comprises a rolled surface and the second surface portion comprises a rolled surface, eg, cast aluminum products such as slabs, ingots, shades, sheets, plates. Includes the surface of the article formed by rolling. In some embodiments, these rolled surfaces are formed according to the process described below. For example, the rolled surface of the first surface portion and the rolled surface of the second surface portion can be formed by a process involving cold rolling. In some embodiments, hot rolling is performed prior to cold rolling. In some embodiments, hot rolling is performed prior to cold rolling.

The aluminum alloy article can have any suitable physical composition. The aluminum alloy article is optionally a rolled aluminum alloy plate, shade, or sheet. In some embodiments, the aluminum alloy article is a rolled aluminum alloy shade. The rolled aluminum alloy shade can have any suitable thickness, but in some embodiments it is in the range of 4 mm to 15 mm, or 14 mm or less, or 13 mm or less, or 12 mm or less, or 11 mm or less, or It has a thickness of 10 mm or less, 9 mm or less, 8 mm or less, 7 mm or less, 6 mm or less, or 5 mm or less. In some embodiments, the aluminum alloy article is a rolled aluminum alloy sheet. The rolled aluminum alloy sheet can have any suitable thickness, but in some embodiments it ranges from 0.05 mm to 4 mm, or 3 mm or less, or 2 mm or less, or 1 mm or less, or 0. It has a thickness of 5 mm or less, 0.3 mm or less, or 0.1 mm or less. In some embodiments, the aluminum alloy article is 15 mm, or 14 mm, or 13 mm, or 12 mm, or 11 mm, or 10 mm, or 9 mm, or 8 mm, or 7 mm, or 6 mm, or 5 mm, or 4 mm, or 3 mm. Alternatively, a rolled aluminum alloy shade or a rolled aluminum alloy sheet having a thickness of 2 mm, or 1 mm, or 0.5 mm, or 0.3 mm, or 0.1 mm.

The present disclosure refers to a particular "surface portion" (s), such as a first surface portion and a second surface portion. Such surface portions are constant along the surface of the article, such as the rolled surface, and under the surface along the thickness of the article (ie, lines running perpendicular to the respective surfaces of the first and second surface portions). Includes an amount of material (eg, uniform depth of material). The first surface portion may optionally be 40.0% or less, or 35.0% or less, or 33.3% or less, or 30.0 of the thickness of the aluminum alloy article from the surface of the first surface portion. It extends to a depth of% or less, or 25.0% or less, or 20.0% or less, or 15.0% or less, or 10.0% or less. In some embodiments, the second surface portion is 40.0% or less, or 35.0% or less, or 33.3% or less, the thickness of the aluminum alloy article from the surface of the second surface portion. Or it extends to a depth of 30.0% or less, or 25.0% or less, or 20.0% or less, or 15.0% or less, or 10.0% or less. In some embodiments, the first surface portion and the second surface portion are of the same depth, i.e., symmetrical in depth with respect to the midpoint of the distance between the two surfaces. However, in some other embodiments, the first surface portion and the second surface portion have different depths.

The present disclosure also refers to an "intermediate portion" between a first surface portion and a second surface portion. The intermediate portion is optionally not included in the first surface portion and the second surface portion so that the intermediate portion extends from the depth of the first surface portion to the depth of the second surface portion. Includes the remaining material between the two surfaces. Thus, in some embodiments, all material between the two surfaces is included in either the first surface portion, the second surface portion, or the intermediate portion. The intermediate portion optionally does not include all of the remaining material between the two surfaces that is not included in the first surface portion and the second surface portion. In some embodiments, the intermediate portion is between the depth of the first surface portion and the depth of the second surface portion, and between the depth of the first surface portion and the depth of the second surface portion. 10.0% or less, or 20.0% or less, or 30.0% or less of the thickness between the depth of the first surface portion and the depth of the second surface portion, including the midpoint of the thickness of , Or 40.0% or less, or 50.0% or less, or 60.0% or less, or 70.0% or less, or 80.0% or less, or 90.0% or less, or 95.0% or less, Or 97.0% or less, or 99.0% or less is included. In some embodiments, the midpoint of thickness between the depth of the first surface portion and the depth of the second surface portion is at the midpoint of the thickness of the intermediate portion.

The present disclosure provides an aluminum alloy article in which the aluminum alloy material of the first surface portion has a higher degree of recrystallization or recrystallization ratio than the aluminum alloy material of the intermediate portion. In some embodiments, the second surface portion also has a higher degree of recrystallization or recrystallization ratio than the aluminum alloy material in the intermediate portion, and thus in the case of an aluminum alloy plate, shade, or sheet, the plate. The area close to the two surfaces of the, shade, or sheet has a higher degree of recrystallization or recrystallization rate than the area inside the plate, shade, or sheet.

The degree of recrystallization or the ratio of recrystallization can be determined by any suitable method known in the art. For example, in micrographs such as scanning electron micrographs (SEMs) or light micrographs (OMs), higher degrees of recrystallization or recrystallization ratios are observed in terms of grain structures with a higher degree of uniformity. obtain. In some other examples, electron backscatter diffraction (EBSD) can also be used to assess the degree of recrystallization. The degree of recrystallization, as used herein, is optionally described with respect to a "recrystallization ratio" which refers to the formula: 1-LAGB / MAGB + HAGB. In some embodiments, the recrystallization ratio can refer to or represent the proportion, amount, or volume of material to be recrystallized relative to the total amount or volume of material. LAGB refers to the amount of grain boundaries within a given volume (ie, the amount of low-angle grain boundaries) with orientation mismatch between adjacent crystal grains of 2 to 15 °. MAGB refers to the amount of grain boundaries within a given volume (ie, the amount of mid-angle grain boundaries) with orientation discrepancies between adjacent grain boundaries greater than 15 ° and less than 30 °. HAGB refers to the amount of grain boundaries within a given volume (ie, the amount of grain boundaries at high angles) with orientation discrepancies between adjacent crystal grains greater than 30 °. The amount or value of LAGB, MAGB, and HAGB can be determined by measuring the angle of orientation mismatch between adjacent grains, as recorded by EBSD. If the material is restored or recrystallized and the heavily deformed material is annealed at high temperatures, the energy stored in the material can be reduced. Recovery competes with recrystallization, as both are triggered by the stored energy during annealing. Recovery can be defined as the annealing process that occurs in the deformed material that occurs without the movement of grain boundaries at high angles. The deformed structure is often a cell-like structure with walls having dislocation angles. As recovery progresses, these cell walls migrate towards true subgrain structures. This occurs through the gradual removal of dislocations from the outside and the rearrangement of the remaining dislocations to low-angle grain boundaries. However, recrystallization is the formation of new grain structures in the deformed material due to the formation and movement of high-angle grain boundaries caused by the accumulated energy of the deformation. Therefore, LAGB is removed during the recrystallization process.

The aluminum alloy material of the first surface portion optionally has a recrystallization ratio higher than the recrystallization ratio of the aluminum alloy material of the intermediate portion. The first surface portion is optionally at least 0.01 higher (eg, 0.01-1.0), or at least 0.03 higher, or at least 0 than the recrystallization ratio of the aluminum alloy material in the middle portion. .05 high, or at least 0.07 high, or at least 0.10 high, or at least 0.15 high, or at least 0.20 high, or at least 0.25 high, or at least 0.30 high, or at least 0. It has a recrystallization rate that is 35 higher, or at least 0.40 higher, or at least 0.45 higher, or at least 0.50 higher.

The aluminum alloy material of the second surface portion optionally has a recrystallization ratio higher than the recrystallization ratio of the aluminum alloy material of the intermediate portion. The second surface portion is optionally at least 0.01 higher (eg, 0.01-1.0), or at least 0.03 higher, or at least 0 than the recrystallization ratio of the aluminum alloy material in the middle portion. .05 high, or at least 0.07 high, or at least 0.10 high, or at least 0.15 high, or at least 0.20 high, or at least 0.25 high, or at least 0.30 high, or at least 0. It has a recrystallization rate that is 35 higher, or at least 0.40 higher, or at least 0.45 higher, or at least 0.50 higher.

The aluminum alloy material of the first surface portion is optionally at least 0.50, or at least 0.55, or at least 0.60, or at least 0.65, or at least 0.70, or at least 0.75, or It has a recrystallization ratio of at least 0.80, or at least 0.85, or at least 0.90. For example, the first surface portion can have a recrystallization ratio of 0.5-1.0.

The aluminum alloy material of the second surface portion is optionally at least 0.50, or at least 0.55, or at least 0.60, or at least 0.65, or at least 0.70, or at least 0.75, or It has a recrystallization ratio of at least 0.80, or at least 0.85, or at least 0.90. For example, the second surface portion can have a recrystallization ratio of 0.5-1.0.

The aluminum alloy material in the intermediate part is optionally 0.25 or less, or 0.30 or less, or 0.35 or less, or 0.40 or less, or 0.45 or less, or 0.50 or less, or 0.55. It has a recrystallization ratio of 0.60 or less, or 0.65 or less. For example, the intermediate portion can have a recrystallization ratio of 0 to 0.65 or 0.01 to 0.65.

When subjected to the bendability test according to the Specification VDA 238-100, the aluminum alloy article is optionally 138 ° or less, 137 ° or less, 136 ° or less, 135 ° or less, 134 ° or less, such as 100 ° to 142 °. It has a β angle of 133 ° or less, 132 ° or less, or 131 ° or less.

Optionally, the aluminum alloy article optionally has an EA exfoliation corrosion score when subjected to the exfoliation corrosion test according to ASTM test number G34-01.

How to prepare aluminum alloy articles

In certain embodiments, the disclosed aluminum alloy article is a product of the disclosed method. Without intending to limit the scope of the invention described herein, the properties of the aluminum alloy articles described herein are partially determined by the formation of certain microstructures during their preparation. Will be done.

In at least one embodiment, the present disclosure provides a method for producing an aluminum alloy article, the method comprising preparing an aluminum alloy as a molten aluminum alloy in a molten state and casting a molten aluminum alloy to cast an aluminum alloy. Forming a product, homogenizing an aluminum alloy cast product to form a homogenized aluminum alloy cast product, and rolling a homogenized aluminum alloy cast product, a first rolling having a first thickness. To form an aluminum alloy product, where rolling includes one or more hot rolling passes, and one or more cold rolling passes, and one or more hot rolling passes are one or more cold rolling. Forming prior to the path and bleaching the first rolled aluminum alloy product at a temperature above the minimum recrystallization temperature of the aluminum alloy by 50 ° C or less to form the first annealed aluminum alloy product. Includes rolling a first rolled aluminum alloy product to form a second rolled aluminum alloy product with a second thickness.

FIG. 1 provides an overview of how to make an aluminum alloy article. The method of FIG. 1 begins with step 105 in which the aluminum alloy 106 is cast to form an aluminum alloy casting product 107, such as an ingot or other casting product. In step 110, the aluminum alloy casting product 107 is homogenized to form the homogenized aluminum alloy casting product 111. In step 115, the homogenized aluminum alloy casting product 111 is subjected to one or more hot rolling passes and one or more cold rolling passes to form the first rolled aluminum alloy product 112. In step 120, the first rolled aluminum alloy product 112 is annealed to form the first annealed aluminum alloy product 121. In step 125, the first annealed aluminum alloy product 121 is subjected to a second rolling process to form a second rolled aluminum product 126 that can accommodate aluminum alloy articles. The second rolled aluminum product 126 is optionally subjected to one or more additional molding or stamping processes to form an aluminum alloy article.
casting

The method disclosed herein may include casting a molten aluminum alloy to form an aluminum alloy cast product. In some embodiments, the molten alloy can be processed prior to casting. The treatment may include one or more of degassing, in-line fluxing, and filtration. Aluminum alloy castings can be formed using any casting process performed according to standards commonly used in the aluminum industry, as known to those of skill in the art.

As some non-limiting examples, the casting process may include a direct chill (DC) casting process or a continuous casting (CC) process. A continuous casting system may include a pair of moving facing casting surfaces (eg, moving facing belts, rolls or blocks), a casting cavity between pairs of moving facing casting surfaces, and a molten metal injector. The molten metal injector can have an end opening from which the molten metal can exit the molten metal injector and be injected into the casting cavity. In some embodiments, the CC process may include, but is not limited to, the use of twin belt casting machines, twin roll casting machines, or block casting machines. In some embodiments, the casting process is performed by a CC process to form the casting product in forms such as billets, slabs, shades, strips and the like.

The clad layer in the cast product can be attached to the core layer in the cast product to form the clad product by any means known to those skilled in the art. For example, the clad layer is directly chill cocast (ie, as described in US Pat. Nos. 7,748,434 and 8,927,113, which are incorporated herein by reference in their entirety. By hot and cold rolling of composite ingots, as described in US Pat. No. 7,472,740, which is incorporated herein by reference in its entirety, or with a core. It can be attached to the core layer by roll bonding to achieve the required metallurgical bonding with the cladding. The initial and final dimensions of the clad aluminum alloy product described herein can be determined by the desired properties of the overall final product.

The roll joining process can be performed in a different manner known to those skilled in the art. For example, the roll joining process can include both hot rolling and cold rolling. In addition, the roll joining process can be a single process or a multi-process in which the material is gauged down during a continuous rolling process. The separate rolling steps can be optionally separated by other processing steps, including, for example, annealing steps, washing steps, heating steps, cooling steps and the like.

Cast products such as ingots, billets, slabs, shades and strips can be processed by any means known to those of skill in the art. Optionally, a processing step can be used to prepare the sheet. Such treatment steps include, but are not limited to, homogenization, hot rolling, cold rolling, solution heat treatment, and any pre-aging steps known to those of skill in the art. The processing process can be suitably applied to any casting product including, but not limited to, ingots, billets, slabs, strips, plates, shades, etc., using modifications and techniques known to those of skill in the art. As described below, certain treatment steps may be used to prepare aluminum alloy articles with a particular recrystallization ratio distribution.

In some cases, the casting process can affect the recrystallization and modification that may occur during subsequent processing steps. For example, the distribution of dispersoid-forming elements in castings such as ingots can affect the ability of the casting to recrystallize. By selectively segregating the dispersoid forming elements during the casting process, different regions of the cast and treated products and articles may tend to recrystallize to varying degrees. Dispersoid-forming elements include, for example, Mn, Cr, Ti, Zr, and Sc, which can precipitate from supersaturated solutions in the form of nanoscale precipitates, which can be, for example, 10 nm to 30 nm in diameter. These precipitates may have a size that does not promote recrystallization nucleation like larger particles. Instead, these particles can suppress dislocations and grain boundary movements so that recrystallization is suppressed. The volume or mass fraction of these dispersoids can determine or influence the particular recrystallization behavior of the cast product.

In large-scale casting, depletion or accumulation of alloying elements can occur. This is known as macrosegregation and can be caused by the relative motion of the solid and liquid phases, which are essentially different compositions. The center of the ingot may be particularly susceptible to macrosegregation, such as during casting. For example, this area of the ingot may indicate depletion of eutectic elements, with relative depletion proportional to casting rate. This characteristic, "Macrosegregation in Aluminum Alloy Ingot Cast by the Semicontinuous Direct Chill (DC) Method, International Conference on Aluminum alloys - Their physical and mechanical properties, Charlottesville, Virginia Warley (UK):. EMAS; 1986, p.17- 29 ”will be further elucidated by Yu and Granger.

Similarly, dispersoid-forming elements may also be selectively enriched at the centerline, which can also be enhanced by increasing the casting rate. Therefore, varying the casting rate may optimize the distribution of dispersoid forming elements in the center of the ingot, which can affect the rate at which recrystallization can occur. For example, by increasing the casting rate in ingots containing dispersoid forming elements, their concentration at the center of the ingot can be increased compared to slower casting rates. The increased dispersoid content of the corresponding solidified ingot can then be used in subsequent processing steps (eg rolling, annealing, etc.) to affect the recrystallization rate at the center of the treated object. In this way, casting can affect the amount and rate of recrystallization in the intermediate portion compared to the surface portion, for example during subsequent rolling and annealing steps. Thus, the methods disclosed herein are optionally such as 1.5 to 10 inches / minute (IPM), 2.5 to 10 IPM, 3.5 to 10 IPM, or 4.5 to 10 IPM. High speed casting processes such as over 1.5 IPM can be utilized.
Stress relaxation

The methods disclosed herein can optionally also include a stress relaxation step, which heats an aluminum alloy casting prepared from the alloy compositions described herein to at least 300. Includes reaching a peak metal temperature (PMT) of ° C., up to 420 ° C. In some embodiments, stress relaxation is 300 ° C, or 310 ° C, or 320 ° C, or 330 ° C, or 340 ° C, or 350 ° C, or 360 ° C, or 370 ° C, or 380 ° C, or 390 ° C. Or run at a temperature of 400 ° C, or 410 ° C, or 420 ° C. Generally, heating is carried out for a period of at least 8 hours, for a maximum of 24 hours. In some embodiments, heating is carried out for 8 hours, or 9 hours, or 10 hours, or 11 hours, or 12 hours, or 13 hours, or 14 hours, or 15 hours, or 16 hours, or 17 hours. .. It runs for 18 hours, or 19 hours, or 20 hours, or 21 hours, or 22 hours, or 23 hours, or 24 hours. During stress relaxation, the microstructure of the aluminum alloy cast or rolled product can be modified, such as by a recrystallization process or a recovery process.
Homogeneity

The homogenization step heats an aluminum alloy casting prepared from the alloy compositions described herein to at least about 450 ° C. (eg, at least 450 ° C., at least 460 ° C., at least 470 ° C., at least 480 ° C.). Peak metal temperature (PMT) of at least 490 ° C, at least 500 ° C, at least 510 ° C, at least 520 ° C, at least 530 ° C, at least 540 ° C, at least 550 ° C, at least 560 ° C, at least 570 ° C, or at least 580 ° C. May include achieving. For example, aluminum alloy products are available at 520 ° C to 580 ° C, 530 ° C to 575 ° C, 535 ° C to 570 ° C, 540 ° C to 565 ° C, 545 ° C to 560 ° C, 530 ° C to 560 ° C, or 550 ° C to 580 ° C. Can be heated to temperature. The heating rate up to PMT is optionally 100 ° C / hour or less, 75 ° C / hour or less, 50 ° C / hour or less, 40 ° C / hour or less, 30 ° C / hour or less, 25 ° C / hour or less, 20 ° C / hour. Below, it is 15 ° C./hour or less. The heating rate up to PMT is optionally 10 ° C / min to 100 ° C / min (eg, 10 ° C / min to 90 ° C / min, 10 ° C / min to 70 ° C / min, 10 ° C / min to 60 ° C / min). Minutes, 20 ° C / min to 90 ° C / min, 30 ° C / min to 80 ° C / min, 40 ° C / min to 70 ° C / min, or 50 ° C / min to 60 ° C / min).

In some cases, the cast aluminum alloy product can then be heat-isolated (ie, kept at a particular temperature, such as PMT) for a period of time. In some embodiments, the cast aluminum alloy product can be thermalized for up to 15 hours (eg, comprehensively 30 minutes to 6 hours). For example, in some embodiments, the aluminum alloy product is 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours at a temperature of at least 450 ° C. The heat is equalized for 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, 15 hours, or any time between them.

In some embodiments, the homogenization described herein can be performed in a two-step homogenization step. In some embodiments, the homogenization process can include the heating and soaking steps described above, which can be referred to as the first step and can further include a second step. In the second stage of the homogenization process, the temperature of the cast aluminum alloy product is raised to a temperature higher than the temperature used in the first stage of the homogenization process. The temperature of the cast aluminum alloy product can be raised, for example, to a temperature at least 5 ° C. higher than the temperature of the cast aluminum alloy product during the first stage of the homogenization process. For example, the temperature of the cast aluminum alloy product can be raised to a temperature of at least 455 ° C (eg, at least 460 ° C, at least 465 ° C, or at least 470 ° C). The heating rate to the homogenization temperature in the second step can be 5 ° C./hour or less, 3 ° C./hour or less, or 2.5 ° C./hour or less. The cast aluminum alloy product can then be thermalized for a period of time during the second step. In some embodiments, the cast aluminum alloy product can be thermalized for up to 10 hours (eg, comprehensively 30 minutes to 10 hours). For example, soaking an aluminum alloy casting product at a temperature of at least 455 ° C. for 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, or 10 hours. Can be transformed. In some embodiments, after homogenization, the cast aluminum alloy product is cooled to room temperature in air.
Hot rolling

After the homogenization step, one or more hot rolling passes may be performed. In some cases, aluminum alloy products are placed at temperatures in the range of 250 ° C to 550 ° C (eg, 300 ° C to 500 ° C, or 350 ° C to 450 ° C) and hot rolled.

In certain embodiments, the aluminum alloy product is hot rolled into a 4 mm to 15 mm thick gauge (eg, 5 mm to 12 mm thick gauge), which is referred to as a shade. For example, aluminum alloy products include 15 mm thick gauge, 14 mm thick gauge, 13 mm thick gauge, 12 mm thick gauge, 11 mm thick gauge, 10 mm thick gauge, 9 mm thick gauge, 8 mm thick gauge, 7 mm thick gauge, 6 mm thick gauge, or 5 mm thick gauge. It can be hot rolled into gauges, or gauges of any thickness between them.

In certain other embodiments, the aluminum alloy product can be hot rolled (ie, plate) to gauges greater than 15 mm thick. For example, aluminum alloy products include 25 mm thick gauge, 24 mm thick gauge, 23 mm thick gauge, 22 mm thick gauge, 21 mm thick gauge, 20 mm thick gauge, 19 mm thick gauge, 18 mm thick gauge, 17 mm thick gauge, or 16 mm thick gauge, or them. It can be hot rolled to any suitable gauge between, or gauges greater than 25 mm thick.

In other cases, the aluminum alloy product can be hot rolled to a gauge of 4 mm or less (ie, plate). In some embodiments, the aluminum alloy product is hot rolled into a 1 mm-4 mm thick gauge, which is referred to as a sheet. For example, aluminum alloy products can be hot rolled into 4 mm thick gauges, 3 mm thick gauges, 2 mm thick gauges, or 1 mm thick gauges, or gauges of any thickness in between.
Cold rolling, annealing, and further rolling

After hot rolling, one or more cold rolling passes may be performed. In certain embodiments, the rolled product from the hot rolling process (eg, plate, shade, or sheet) can be cold rolled into a thin gauge shade or sheet. In some embodiments, the thin gauge shade or sheet is cold rolled to 1.0 mm to 12.0 mm, or 2.0 mm to 8.0 mm, or 3.0 mm to 6.0 mm, or 4 It has a thickness in the range of 0.0 mm to 5.0 mm (ie, a first thickness). In some embodiments, the thin gauge shade or sheet is cold rolled to 12.0 mm, 11.9 mm, 11.8 mm, 11.7 mm, 11.6 mm, 11.5 mm, 11.4 mm, 11.3 mm, 11.2 mm, 11.1 mm, 11.0 mm, 10.9 mm, 10.8 mm, 10.7 mm, 10.6 mm, 10.5 mm, 10.4 mm, 10.3 mm, 10.2 mm, 10. 1mm, 10.0mm, 9.9mm, 9.8mm, 9.7mm, 9.6mm, 9.5mm, 9.4mm, 9.3mm, 9.2mm, 9.1mm, 9.0mm, 8.9mm, 8.8 mm, 8.7 mm, 8.6 mm, 8.5 mm, 8.4 mm, 8.3 mm, 8.2 mm, 8.1 mm, 8.0 mm, 7.9 mm, 7.8 mm, 7.7 mm, 7.7 mm. 6mm, 7.5mm, 7.4mm, 7.3mm, 7.2mm, 7.1mm, 7.0mm, 6.9mm, 6.8mm, 6.7mm, 6.6mm, 6.5mm, 6.4mm, 6.3 mm, 6.2 mm, 6.1 mm, 6.0 mm, 5.9 mm, 5.8 mm, 5.7 mm, 5.6 mm, 5.5 mm, 5.4 mm, 5.3 mm, 5.2 mm, 5. 1mm, 5.0mm, 4.9mm, 4.8mm, 4.7mm, 4.6mm, 4.5mm, 4.4mm, 4.3mm, 4.2mm, 4.1mm, 4.0mm, 3.9mm, 3.8 mm, 3.7 mm, 3.6 mm, 3.5 mm, 3.4 mm, 3.3 mm, 3.2 mm, 3.1 mm, 3.0 mm, 2.9 mm, 2.8 mm, 2.7 mm, 2. 6 mm, 2.5 mm, 2.4 mm, 2.3 mm, 2.2 mm, 2.1 mm, 2.0 mm, 1.9 mm, 1.8 mm, 1.7 mm, 1.6 mm, 1.5 mm, 1.4 mm, It has a thickness of 1.3 mm, 1.2 mm, 1.1 mm, or 1.0 mm, or any between them.

In some embodiments, the one or more cold rolling passes make the thickness of the rolled aluminum product at least 30%, or at least 35%, or at least 40%, or at least 45%, or at least 50%, or Reduce by at least 55%, or at least 60%, or at least 65%, or at least 70%. In some embodiments, one or more cold rolling passes make the cast product 10 mm or less, or 9 mm or less, or 8 mm or less, or 7 mm or less, or 6 mm or less, or 5 mm or less (ie, first). Reduce to 1 thickness).

Annealing can be performed after one or more cold rolling passes. Because this is done in the middle of the rolling process, in some embodiments, one or more additional rolling passes are performed after annealing, thus intermediate annealing or intermediate-annealing. Can also be called.

The annealing step brings the rolled aluminum product from room temperature to 380 ° C to 500 ° C (eg, 385 ° C to 495 ° C, 390 ° C to 490 ° C, 395 ° C to 485 ° C, 400 ° C to 480 ° C, 405 ° C. ~ 475 ° C, 410 ° C to 470 ° C, 415 ° C to 465 ° C, 420 ° C to 460 ° C, 425 ° C to 455 ° C, 430 ° C to 460 ° C, 380 ° C to 450 ° C, 405 ° C to It may include heating to a temperature of 475 ° C, or 430 ° C to 500 ° C).

This intermediate annealing step can result in certain beneficial texture features, for example, in the resulting article. In particular, intermediate annealing assists in the formation of recrystallized microstructures on the surface of the article and the restored and / or uncrystallized structure in the center of the article. In some examples, the texture of the surface of the article is dominated by recrystallized components, including cubes, cubes ND, cubes RD, rather than deformation type components such as Bs, S, and Cu. Therefore, the bending performance of the article is improved without reducing the strength.

The plate, shade, or sheet can be homogenized for a period of time at an intermediate annealing temperature. In one non-limiting example, the plate, shade, or sheet can be thermalized for up to about 2 hours (eg, comprehensively about 15 to about 120 minutes). For example, a plate, shade, or sheet is placed at a temperature of about 400 ° C. to about 500 ° C. for 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes. , 65 minutes, 70 minutes, 75 minutes, 80 minutes, 85 minutes, 90 minutes, 95 minutes, 100 minutes, 105 minutes, 110 minutes, 115 minutes, or 120 minutes, or any time between them. Can be done.

In some embodiments, intermediate annealing of the rolled aluminum alloy product causes the minimum recrystallization temperature of the aluminum alloy to be 45 ° C or lower, or 40 ° C or lower, or 35 ° C or lower, or 30 ° C or lower, or 25 ° C or lower, or It is carried out at a temperature of 20 ° C. or lower, or 15 ° C. or lower, or 10 ° C. or lower. In some embodiments, the intermediate annealing of the rolled aluminum alloy product is at a temperature above the minimum recrystallization temperature of the aluminum alloy, within 3.0 hours, or within 2.5 hours, or within 2.0 hours, or 1 . Run within 5 hours, or within 1.0 hour.

The intermediate annealing may optionally include a plurality of annealing sub-steps. For example, in some embodiments, annealing is performed at a first temperature above the minimum recrystallization temperature over the first period and at a second temperature above the minimum recrystallization temperature over the second period. For example, the first temperature above the minimum recrystallization temperature may be higher than the second temperature above the minimum recrystallization temperature. Annealing can, for example, expose the surface portion to higher temperature annealing conditions earlier than the intermediate portion. By using a two-step (or higher) intermediate annealing process in which the temperature of the second step is lower than that of the first step, the surface portion of the rolled aluminum alloy product is recrystallized for a longer time than the intermediate portion. Can be offered to. This can also occur in a single-step intermediate annealing process where a single annealing temperature is used, but the effect can be more pronounced in a multi-step annealing process.

After intermediate annealing, further rolling, such as cold rolling, is optionally performed. In some embodiments, one or more additional cold rolling passes are performed. With this additional rolling, the aluminum alloy product has a final thickness (ie, a second thickness). In some embodiments, the final thickness is in the range of 0.1 mm to 4.0 mm. In some embodiments, the final thickness is 4.0 mm, 3.9 mm, 3.8 mm, 3.7 mm, 3.6 mm, 3.5 mm, 3.4 mm, 3.3 mm, 3.2 mm, 3. 1mm, 3.0mm, 2.9mm, 2.8mm, 2.7mm, 2.6mm, 2.5mm, 2.4mm, 2.3mm, 2.2mm, 2.1mm, 2.0mm, 1.9mm, 1.8 mm, 1.7 mm, 1.6 mm, 1.5 mm, 1.4 mm, 1.3 mm, 1.2 mm, 1.1 mm, 1.0 mm, 0.9 mm, 0.8 mm, 0.7 mm, 0. It is 6 mm, 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm, or 0.1 mm. In some further such embodiments, the final thickness is 4.0 mm or less, or 3.5 mm or less, or 3.0 mm or less, or 2.5 mm or less, or 2.0 mm or less, or 1.5 mm or less. , 1.0 mm or less, or 0.5 mm or less, or 0.3 mm or less, or 0.1 mm or less.
Finishing process

After intermediate annealing and / or additional rolling, additional finishing steps can optionally be performed, including, but not limited to, one or more solution forming, quenching, aging, and coiling.

In some embodiments, a solution heat treatment step can be performed. The solution heat treatment step may include heating the aluminum alloy product from room temperature to a temperature of 430 ° C to 500 ° C. For example, the solution heat treatment step may include heating the aluminum alloy product from room temperature to a temperature of 440 ° C to 500 ° C, 460 ° C to 500 ° C, or 480 ° C to 490 ° C. In some examples, the heating rate of the solution treatment step is 250 ° C./hour to 350 ° C./hour (eg, 250 ° C./hour, 255 ° C./hour, 260 ° C./hour, 265 ° C./hour, 270 ° C. / Hour, 275 ° C./hour, 280 ° C./hour, 285 ° C./hour, 290 ° C./hour, 295 ° C./hour, 300 ° C./hour, 305 ° C./hour, 310 ° C./hour, 315 ° C./hour, 320 ° C. / Hour, 325 ° C./hour, 330 ° C./hour, 335 ° C./hour, 340 ° C./hour, 345 ° C./hour, or 350 ° C./hour).

In some embodiments, the aluminum alloy product is then subjected to a quenching process based on the selected gauge, up to a temperature of about 25 ° C., with a quenching rate that can vary between about 50 ° C./sec and 400 ° C./sec. Can be cooled. For example, the quenching speed is about 50 ° C./sec to about 375 ° C./sec, about 60 ° C./sec to about 375 ° C./sec, about 70 ° C./sec to about 350 ° C./sec, about 80 ° C./sec to about 325. ℃ / sec, about 90 ° C / sec to about 300 ° C / sec, about 100 ° C / sec to about 275 ° C / sec, about 125 ° C / sec to about 250 ° C / sec, about 150 ° C / sec to about 225 ° C / sec. It can be seconds, or from about 175 ° C / sec to about 200 ° C / sec.

In the quenching step, the aluminum alloy product is rapidly quenched with liquid (eg water) and / or gas, or another selected quenching medium. In certain embodiments, the aluminum alloy product can be rapidly hardened with water. In certain embodiments, the aluminum alloy product is air-quenched.

In some embodiments, the aluminum alloy product can be artificially aged for a period of time to result in a T6 or T7 temper. In certain embodiments, the aluminum alloy product has a period of about 100 ° C to 225 ° C (eg, 100 ° C, 105 ° C, 110 ° C, 115 ° C, 120 ° C, 125 ° C, 130 ° C, 135 ° C, 140 ° C, 145 ° C, 150 ° C, 155 ° C, 160 ° C, 165 ° C, 170 ° C, 175 ° C, 180 ° C, 185 ° C, 190 ° C, 195 ° C, 200 ° C, 205 ° C, 210 ° C, 215 ° C, 220 ° C, or 225. At ° C), it can be artificially aged (AA). Aluminum alloy products are optionally cold-worked for a period of about 15 minutes to about 48 hours (eg, 15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7). Hours, 8 hours, 9 hours, 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours, 24 hours, 25 hours, 26 hours, 27 hours, 28 hours, 29 hours, 30 hours, 31 hours, 32 hours, 33 hours, 34 hours, 35 hours, 36 hours, 37 hours, 38 hours, 39 hours, 40 hours , 41 hours, 42 hours, 43 hours, 44 hours, 45 hours, 46 hours, 47 hours, or 48 hours, or any time in between), can be artificially aged.

In some embodiments, during or after production, the annealing process can also be applied to produce coiled aluminum alloy products for improved productivity or formability. For example, the coiled alloy can be supplied in O temper using a hot or cold rolling step and an annealing step following the hot or cold rolling step. Molding can be performed at O tempering degree, followed by solution heat treatment, quenching, and artificial aging / paint baking.

In certain embodiments, the annealing step can be applied to the coil in order to produce an aluminum alloy product that is in coil shape and has higher moldability compared to F tempering. Although not intended to limit the present invention, the objectives of annealing and annealing parameters are to (1) release work hardening in the material for formability and (2) cause significant grain growth. Recrystallizing or recovering the material without the need for (3) designing or converting suitable textures to form and reduce anisotropies during molding, and (4) existing precipitation. It may include avoiding grain coarsening.

In one or more embodiments, the present disclosure provides an aluminum alloy article formed by the process described above or in any of its embodiments.
Manufactured goods

The present disclosure provides manufactured articles composed of aluminum alloy products disclosed herein. In some embodiments, the manufactured article is composed of a rolled aluminum alloy product. Examples of such manufactured goods are parts, bridges, pipelines, pipes, tubes, boats, ships, storage for automobiles, trucks, trailers, trains, railroad vehicles, airplanes, body panels, or any of the aforementioned. Examples include, but are not limited to, containers, storage tanks, furniture, windows, doors, railings, functional or decorative buildings, pipe railings, electrical components, conduits, beverage containers, food containers, or foils.

In some embodiments, the aluminum alloy articles disclosed herein may be used in automotive and / or transportation applications, including motor vehicle, aircraft, and rail applications, or in any other desired application. .. In some examples, the aluminum alloy products disclosed herein are bumpers, side beams, roof beams, cross beams, pillar reinforcements (eg, A-pillars, B-pillars, and C-pillars), inner panels, outers. It can be used to prepare automobile body parts products such as panels, side panels, inner hoods, outer hoods and trunk lid panels. The aluminum alloys and methods described herein can also be used in aircraft or rail vehicle applications, for example, to prepare exterior and interior panels.

In some other embodiments, the aluminum alloy articles disclosed herein can be used in electronic applications. For example, the aluminum alloy products disclosed herein can also be used to prepare housings for electronic devices, including mobile phones and tablet computers. In some examples, the alloy can be used to prepare the outer casing of a mobile phone (eg, a smartphone) and the housing for a tablet bottom chassis.

In some other embodiments, the aluminum alloy articles disclosed herein can be used for industrial applications. For example, the aluminum alloy products disclosed herein can be used to prepare products for the general secondary market.

In some other embodiments, the aluminum alloy articles disclosed herein can be used as aerospace body parts. For example, the aluminum alloy articles disclosed herein can be used to prepare structural aerospace body parts such as wings, fuselage, ailerons, rudders, elevators, cowlings, or supports. In some other embodiments, the aluminum alloy articles disclosed herein can be used to prepare non-structural aerospace body parts such as seat trucks, seat frames, panels, or hinges.

The following examples serve to further illustrate certain embodiments of the present disclosure, without simultaneously constructing any limitation thereof. On the contrary, after reading the description herein, it can be applied to various embodiments, modifications and equivalents that can suggest themselves to those skilled in the art without departing from the spirit of the invention. Should be clearly understood.
Example 1-Alloy composition

実施例２−アルミニウム合金シートの製造 Six aluminum alloys (A1 / alloy A1, A2 / alloy A2, A3 / alloy A3, A4 / alloy A4, A5 / alloy A5, and A6 / alloy A6) were prepared, and their elemental compositions are shown in Table 3 below. To do. The elemental composition is provided as a percentage by weight.

Example 2-Manufacture of aluminum alloy sheet

From Table 3 (Example 1), a test aluminum alloy sheet having a chemical composition corresponding to alloys A1 to A6 was cast by direct chill (DC) casting. All were stress relaxed, homogenized and then hot rolled into a hot band with a gauge of 10.5 mm. Each was then subjected to cold rolling. For each, hot bands were passed through two-pass cold rolling of 10.5 mm to 6 mm and 4 mm, respectively.

Intermediate annealing of alloys A1, A2, and A3 was performed on a 4.0 mm gauge at a temperature rise rate of 50 ° C./hour to 410 ° C., soaking for 60 minutes, then cooling to 350 ° C. in a furnace for 1200 minutes. The heat was equalized. The coil was cooled to room temperature in air. The final cold rolling was then performed on these three samples, alloys A1, A2, and A3. The coil was cold rolled to a final gauge of 2.0 mm in one pass.

For alloys A4, A5, and A6, a 10.5 mm gauge hot band was cold rolled to 6.0 mm, then 4.0 mm, then 2.8 mm, then 2.0 mm without any intermediate annealing steps.

A solution heat treatment of the test blanks of the alloys A1 to A6 samples was performed, where the samples were heated to a PMT of 480 ° C. using a furnace and homogenized for 5 minutes before being removed from the furnace for approximately 350. It was quenched in warm water at 55 ° C. at a quenching rate of ° C./sec. Artificial aging of the alloys A1-A6 samples was performed using a furnace at 125 ° C. and heat equalized for 24 hours to give the samples T6 tempering.
Example 3-Optical microscopy and Scanning Electron Micrograph using EBSD

Optical microscopy (OM) was performed on the aluminum alloy sheet made from the alloy of Example 1 according to Example 2. FIG. 2 shows a light micrograph (OM) of a cross section of a sample of Alloy A1 showing microstructures that have been lab rolled using intermediate annealing and have not recovered and / or recrystallized through the thickness of the sample. FIG. 3A shows an optical micrograph (OM) of a cross section of a sample of alloy A1 that was plant rolled using intermediate annealing. The sample of alloy A1 of FIG. 3A includes a first surface portion 205, an intermediate portion 210, and a second surface portion 215.

The "plant rolled" sample was cold rolled according to a standard plant cold rolling process. The "lab rolled" samples were cold rolled in a lab setting of 10.5 mm to 2.0 mm, each performing 17 different passes reducing the thickness by about 0.5 mm.

FIG. 3B shows the surface portion from FIG. 3A and shows the recrystallized microstructure corresponding to at least a portion of the first surface portion 205 or the second surface portion 215. In FIG. 3B, the grain structure of the sample can be seen, the individual grains do not spread much to the surface portion, and the crystal structure has not been restored and / or recrystallized by the intermediate annealing process. Show that. FIG. 3C shows nine modified reduced size versions of FIG. 3B produced by reducing FIG. 3B to nine individual colors in order to emphasize the various colors shown in FIG. 3B as black. For example, in panel 1, the dark purple feature of FIG. 3B is shown in black. In panel 2, the lilac features of FIG. 3B are shown in black. In panel 3, the black features of FIG. 3B are shown in black. In panel 4, the light blue features of FIG. 3B are shown in black. In panel 5, the dark blue feature of FIG. 3B is shown in black. In panel 6, the orange feature of FIG. 3B is shown in black. In panel 7, the mid-blue feature of FIG. 3B is shown in black. In panel 8, the yellow features of FIG. 3B are shown in black. In panel 9, the pink feature of FIG. 3B is shown in black.

FIG. 3D shows the central portion from FIG. 3A and shows the recovered and / or uncrystallized microstructure corresponding to at least a portion of the intermediate portion 210. In FIG. 3D, a significantly expanded grain residue can be seen during the first rolling process. The residue is not entirely recrystallized during the intermediate annealing process, and many regions remain spread out in the central portion, reflecting the restored and / or uncrystallized nature of the intermediate portion 210. FIG. 3E shows nine modified reduced size versions of FIG. 3D produced by reducing FIG. 3D to nine individual colors in order to emphasize the various colors shown in FIG. 3D as black. For example, in panel 1, the dark purple features of FIG. 3D are shown in black. In panel 2, the lilac features of FIG. 3D are shown in black. In panel 3, the black features of FIG. 3D are shown in black. In panel 4, the light blue features of FIG. 3D are shown in black. In panel 5, the dark blue features of FIG. 3D are shown in black. In panel 6, the orange features of FIG. 3D are shown in black. In panel 7, the mid-blue feature of FIG. 3D is shown in black. In panel 8, the yellow features of FIG. 3D are shown in black. In panel 9, the pink features of FIG. 3D are shown in black.

FIG. 4A shows an optical micrograph of a sample of alloy A5 plant-rolled during the cold rolling process without intermediate annealing, showing grain spreads as the horizontal structure of FIG. 4A. FIG. 4B shows a cross section from the central portion of FIG. 4A corresponding to at least a portion of the intermediate portion, showing a recovered and / or uncrystallized microstructure. FIG. 4C shows the surface portion from FIG. 4A and shows the recrystallized microstructure.

Electron backscatter diffraction (EBSD) non-orientation mapping was performed on specific samples. The cross-sectional mapping of the sample of alloy A1 rolled to the final gauge and completed by T6 tempering is shown in FIGS. 5A, 5B, and 5C. Low-angle boundaries (2-15) are marked as darker colored horizon, while medium to high-angle boundaries (> 15) are marked as lighter-colored horizon. FIG. 5A provides a mapping of alloy A1 samples lab-rolled during the cold rolling process without intermediate annealing, which has a uniform microstructure that has not recovered and / or recrystallized throughout the thickness. On the other hand, FIG. 5B provides a mapping of alloy A1 samples plant-rolled using intermediate annealing during the cold rolling process, which provides a recrystallized microstructure near the surface and a central part (ie, intermediate). Partial) shows a microstructure that has not been recovered and / or recrystallized. FIG. 5C shows a mapping of alloy A5 samples plant-rolled during the cold rolling process without intermediate annealing, having a microstructure between those shown in FIGS. 5A and 5B. Quantitative results from these images are shown in Table 4 below.
Example 4-Recrystallization ratio

The recrystallization ratio (RQ) was calculated using the EBSD measurement described in Example 3. Orientation mapping was performed on a square grid across the area cut in cross section. The mapped areas were divided into three equally sized areas over the thickness of the sheet and the recrystallization ratio for each area was calculated. Table 4 reports the values of the recrystallization ratio of each of the samples described in Example 3. The "surface RQ" refers to the RQ of the two surface areas (ie, the surface portion), the "central RQ" refers to the RQ of the central area (ie, the intermediate portion), and the "whole RQ" refers to the sample. Refers to the RQ over the entire thickness. Note that "IA" refers to intermediate annealing performed during the cold rolling process.

The "plant rolled" sample was cold rolled according to a standard plant cold rolling process. The "lab rolled" samples were cold rolled in a lab setting of 10.5 mm to 2.0 mm, each performing 17 different passes reducing the thickness by about 0.5 mm.
Example 5-Bending

The bendability of the sample of the aluminum alloy sheet prepared according to Example 2 was measured. The bendability of the sample was measured according to the Specification VDA 238-100. Samples were tested longitudinally and transversely with T6 tempering. FIG. 6 shows the results of three-point bending of the samples of alloys A1, A2, A5 (without IA) and AA7075 sheet. The reported angle is β angle, so the lower it is, the better. For alloys A1 and A2, the left bar is for the longitudinal direction and the right bar is for the transverse direction. For alloy A5 and AA7076 samples, only the longitudinal direction is shown. All were tested with T6 tempering.
Example 6-Peeling corrosion

実施例７−降伏強度 Detachment corrosion (EXCO) was measured for a particular aluminum alloy sheet prepared according to Example 2. EXCO was measured according to the procedure described in ASTM-G34. This procedure involves continuous immersion of the test material in a solution containing 4M sodium chloride, 0.5M potassium nitrate, and 0.1M nitric acid at 25 ± 3 ° C. Sensitivity to peeling was determined by visual inspection and performance scores were established with reference to standard photographs (see G34 test procedure). A visual inspection was performed along with a longitudinal cross-sectional metallographic inspection. 7A-7E show photographs of the aluminum alloy sheets tested, as identified in Table 5 below.

Example 7-Yield strength

Yield strength was measured for a particular aluminum alloy sheet prepared according to Example 2. Yield strength was tested according to ASTM E8 using a standard gauge length of 2 inches. FIG. 8 shows the results of the yield strength test of a specific sample. Here, L, T, and D represent longitudinal, transverse, and diagonal lines with respect to the rolling direction, respectively. In the case of Alloy A1, Alloy A2, Alloy A3, and Alloy A6, the three rods show longitudinal, transverse, and diagonal test results, respectively, from left to right. In the case of alloy A5, the two rods show the test results in the longitudinal and transverse directions from left to right, respectively.
Illustrative

Any reference to a series of examples, as used below, is selectively understood as a reference to each of these examples.

Example 1 is composed of an aluminum alloy material and has a first surface portion, a second surface portion facing the first surface portion, and an intermediate portion between the first surface portion and the second surface portion. Further included, an aluminum alloy article, the first surface portion comprising a rolled surface, the second surface portion comprising a rolled surface, and the aluminum alloy material of the first surface portion and the second surface portion being an intermediate portion. Has a higher recrystallization rate than the aluminum alloy material of.

Example 2 is any preceding or subsequent exemplary aluminum alloy article, in which the aluminum alloy material is a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy.

Example 3 is any preceding or subsequent exemplary aluminum alloy article, in which the aluminum alloy material is a 7xxx series aluminum alloy.

Example 4 is any preceding or subsequent exemplary aluminum alloy material, wherein the aluminum alloy materials are AA7011, AA7019, AA7020, AA7021, AA7039, AA7072, AA7075, AA7085, AA7108, AA7108A, AA7015, AA7017, AA7018, AA7019A. , AA7024, AA7025, AA7028, AA7030, AA7031, AA7033, AA7035, AA7035A, AA7034, AA7046A, AA7003, AA7004, AA7005, AA7009, AA7010, AA7011, AA7012, AA70710, AA7011, AA7012, AA7074, AA701 , AA7229, AA7032, AA7033, AA7034, AA7036, AA7136, AA7037, AA7040, AA7140, AA7041, AA7049, AA7049A, AA7149,7204, AA7249, AA7349, AA7449, AA7050, AA750AA75A , AA7060, AA7064, AA7065, AA7068, AA7168, AA7175, AA7475, AA7076, AA7178, AA7278, AA7278A, AA7081, AA7181, AA7185, AA7090, AA7093, AA7095, and AA7099.

Example 5 is an aluminum alloy article of any one of the preceding or subsequent examples, wherein the aluminum alloy material is 4.0 to 15.0% by weight Zn, 0.1 to 3.5% by weight. Cu, 1.0 to 4.0% by weight Mg, 0.05 to 0.50% by weight Fe, 0.05 to 0.30% by weight Si, 0.01 to 0.50% by weight Zr , Up to 0.25% by weight Mn, up to 0.20% by weight Cr, up to 0.15% by weight Ti, and up to 0.15% by weight impurities, the balance being Al.

Example 6 is any preceding or subsequent exemplary aluminum alloy article, wherein the aluminum alloy material is 5.6 to 9.3% by weight Zn, 0.2 to 2.6% by weight Cu, 1.4. ~ 2.8% by weight Mg, 0.10 to 0.35% by weight Fe, 0.05 to 0.20% by weight Si, 0.05 to 0.25% by weight Zr, maximum 0.05 weight % Mn, up to 0.10% by weight Cr, up to 0.05% by weight Ti, and up to 0.15% by weight impurities, the balance being Al.

Example 7 is any preceding or subsequent exemplary aluminum alloy article, selected from the group consisting of Mo, Nb, Be, B, Co, Sn, Sr, V, In, Hf, Ag, Sc, and Ni. Further contains one or more elements of up to 0.10% by weight.

Example 8 is an aluminum alloy article of any one of the preceding or subsequent examples, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, It further comprises one or more elements of up to 0.10% by weight selected from the group consisting of Tm, Yb, and Lu.

Example 9 is an aluminum alloy article of any one of the preceding or subsequent examples, in which the rolled surface of the first surface portion is formed by a process involving cold rolling.

Example 10 is an aluminum alloy article of any one of the preceding or subsequent examples, in which the rolled surface of the second surface portion is formed by a process involving cold rolling.

Example 11 is an aluminum alloy article of any one of the preceding or subsequent examples, and the aluminum alloy article is a rolled aluminum alloy shade or a rolled aluminum alloy sheet.

Example 12 is any preceding or subsequent exemplary aluminum alloy article, wherein the aluminum alloy article is 15 mm or less, or 14 mm or less, or 13 mm or less, or 12 mm or less, or 11 mm or less, or 10 mm or less, or 9 mm or less. Or 8 mm or less, or 7 mm or less, or 6 mm or less, or 5 mm or less, or 4 mm or less, or 3 mm or less, or 2 mm or less, or 1 mm or less, or 0.5 mm or less, or 0.3 mm or less, or 0.1 mm or less. Has a thickness.

Example 13 is an aluminum alloy article of any one of the preceding or subsequent examples, wherein the first surface portion is 40.0 of the thickness of the aluminum alloy article from the surface of the first surface portion. % Or less, or 35.0% or less, or 33.3% or less, or 30.0% or less, or 25.0% or less, or 20.0% or less, or 15.0% or less, or 10.0% It extends to the following depths.

Example 14 is an aluminum alloy article of any one of the preceding or subsequent examples, in which the second surface portion is 40.0 of the thickness of the aluminum alloy article from the surface of the second surface portion. % Or less, or 35.0% or less, or 33.3% or less, or 30.0% or less, or 25.0% or less, or 20.0% or less, or 15.0% or less, or 10.0% It extends to the following depths.

Example 15 is an aluminum alloy article of any one of the preceding or subsequent examples, the intermediate portion extending from the depth of the first surface portion to the depth of the second surface portion.

Example 16 is an aluminum alloy article of any one of the preceding or subsequent examples, the intermediate portion being between the depth of the first surface portion and the depth of the second surface portion, the first 10. The thickness between the depth of the first surface portion and the depth of the second surface portion, including the midpoint of the thickness between the depth of the first surface portion and the depth of the second surface portion. 0% or less, or 20.0% or less, or 30.0% or less, or 40.0% or less, or 50.0% or less, or 60.0% or less, or 70.0% or less, or 80.0 % Or less, or 90.0% or less, or 95.0% or less, or 97.0% or less, or 99.0% or less.

Example 17 is any preceding or subsequent exemplary aluminum alloy article, in which the midpoint of thickness between the depth of the first surface portion and the depth of the second surface portion is the thickness of the intermediate portion. It is at the midpoint.

Example 18 is an aluminum alloy article of any one of the preceding or subsequent examples, in which the aluminum alloy material of the second surface portion has a higher recrystallization ratio than the aluminum alloy material of the intermediate portion.

Example 19 is an aluminum alloy article of any one of the preceding or subsequent examples, wherein the aluminum alloy material of the first surface portion is at least 0 than the recrystallization ratio of the aluminum alloy material of the intermediate portion. 0.01 higher, or at least 0.03 higher, or at least 0.05 higher, or at least 0.07 higher, or at least 0.10 higher, or at least 0.15 higher, or at least 0.20 higher, or at least 0. It has a high recrystallization rate, such as 25 high.

Example 20 is an aluminum alloy article of any one of the preceding or subsequent examples, in which the aluminum alloy material of the second surface portion is at least 0 than the recrystallization ratio of the aluminum alloy material of the intermediate portion. 0.01 higher, or at least 0.03 higher, or at least 0.05 higher, or at least 0.07 higher, or at least 0.10 higher, or at least 0.15 higher, or at least 0.20 higher, or at least 0. It has a high recrystallization rate, such as 25 high.

Example 21 is an aluminum alloy article of any one of the preceding or subsequent examples, wherein the aluminum alloy material of the first surface portion is at least 0.50, or at least 0.55, or at least 0. It has a recrystallization ratio of 60, or at least 0.65, or at least 0.70, or at least 0.75, or at least 0.80, or at least 0.85, or at least 0.90.

Example 22 is an aluminum alloy article of any one of the preceding or subsequent examples, wherein the aluminum alloy material of the second surface portion is at least 0.50, or at least 0.55, or at least 0. It has a recrystallization ratio of 60, or at least 0.65, or at least 0.70, or at least 0.75, or at least 0.80, or at least 0.85, or at least 0.90.

Example 23 is an aluminum alloy article of any one of the preceding or subsequent examples, wherein the aluminum alloy material in the intermediate portion is 0.25 or less, or 0.30 or less, or 0.35 or less, or. It has a recrystallization ratio of 0.40 or less, or 0.45 or less, or 0.50 or less, or 0.55 or less, or 0.60 or less, or 0.65 or less.

Example 24 is an aluminum alloy article of any one of the preceding or subsequent examples, where the aluminum alloy article is subject to bendability testing in accordance with Specification VDA 238-100, below 138 °, or 137. It has a β angle of ° or less, or 136 ° or less, or 135 ° or less, or 134 ° or less, or 133 ° or less, or 132 ° or less, or 131 ° or less.

Example 25 is an aluminum alloy article of any one of the preceding or subsequent examples, which is an EA exfoliation corrosion score when subjected to an exfoliation corrosion test according to ASTM test number G34-01. Has.

Example 26 is a method for producing an aluminum alloy article, in which the present method is to prepare an aluminum alloy, in which the aluminum alloy is prepared as a molten aluminum alloy in a molten state, and the molten aluminum alloy is prepared. Casting to form an aluminum alloy cast product, homogenizing an aluminum alloy cast product to form a homogenized aluminum alloy cast product, and rolling a homogenized aluminum alloy cast product to a first thickness. Is to form a first rolled aluminum alloy product with a stake, wherein the rolling includes one or more hot rolling passes and one or more cold rolling passes and one or more hot rolling passes. The first rolled aluminum alloy product is formed and annealed at a temperature above the minimum recrystallization temperature of the aluminum alloy by 50 ° C. or less prior to one or more cold rolling passes. Includes forming a first rolled aluminum alloy product and rolling a second rolled aluminum product having a second thickness.

Example 27 is any preceding or subsequent exemplary method, in which the aluminum alloy is a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy.

Example 28 is any preceding or subsequent exemplary method, in which the aluminum alloy is a 7xxx series aluminum alloy.

Example 29 is any one of the preceding or subsequent examples of any one of the preceding or subsequent examples, wherein the aluminum alloy is 4.0 to 15.0% by weight Zn, 0.1. ~ 3.5% by weight Cu, 1.0 to 4.0% by weight Mg, 0.05 to 0.50% by weight Fe, 0.05 to 0.30% by weight Si, 0.05 to 0 .25% by weight Zr, up to 0.25% by weight Mn, up to 0.20% by weight Cr, up to 0.15% by weight Ti, and up to 0.15% by weight impurities, with the balance Al is there.

Example 30 is any preceding or subsequent exemplary method, wherein the aluminum alloy is 5.6 to 9.3% by weight Zn, 0.2 to 2.6% by weight Cu, 1.4 to 2. 8% by weight Mg, 0.10 to 0.35% by weight Fe, 0.05 to 0.20% by weight Si, 0.05 to 0.15% by weight Zr, maximum 0.05% by weight Mn , Up to 0.10% by weight Cr, up to 0.05% by weight Ti, and up to 0.15% by weight impurities, the balance being Al.

Example 31 is any preceding or subsequent exemplary method, selected from the group consisting of Mo, Nb, Be, B, Co, Sn, Sr, V, In, Hf, Ag, Sc, and Ni. It further contains one or more elements of up to 0.10% by weight.

Example 32 is any one of the preceding or subsequent embodiments, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, It further comprises one or more elements of up to 0.10% by weight selected from the group consisting of Yb and Lu.

Example 33 is any one of the preceding or subsequent examples, in which casting is performed by direct chill (DC) casting.

Example 34 is any one of the preceding or subsequent examples, in which casting is performed by continuous casting.

Example 35 is any preceding or subsequent exemplary method, in which casting is performed by twin belt continuous casting.

Example 36 is any one of the preceding or subsequent examples, in which one or more cold rolling passes of rolling used to form a first rolled aluminum alloy product are: The thickness of the rolled aluminum product is at least 30%, or at least 35%, or at least 40%, or at least 45%, or at least 50%, or at least 55%, or at least 60%, or at least 65%, or at least 70. % Reduce.

Example 37 is any one of the preceding or subsequent embodiments, wherein the first thickness is 10 mm or less, or 9 mm or less, or 8 mm or less, or 7 mm or less, or 6 mm or less, or 5 mm. Below, or 4 mm or less.

Example 38 is the method of any one of any preceding or subsequent examples, the first thickness being 1 mm to 10 mm, or 2 mm to 8 mm, or 3 mm to 6 mm.

Example 39 is any one of the preceding or subsequent examples, in which the annealing of the first rolled aluminum alloy product sets the minimum recrystallization temperature of the aluminum alloy to 45 ° C. or lower, or 40 ° C. or lower. , Or 35 ° C or lower, or 30 ° C or lower, or 25 ° C or lower, or 20 ° C or lower, or 15 ° C or lower, or 10 ° C or lower.

Example 40 is any one of the preceding or subsequent examples, wherein the annealing of the first rolled aluminum alloy product is at a temperature above the minimum recrystallization temperature of the aluminum alloy and within 3.0 hours. , Or within 2.5 hours, or within 2.0 hours, or within 1.5 hours, or within 1.0 hours.

Example 41 is a method of any one of any preceding or subsequent examples, the second thickness being 4.0 mm or less, or 3.5 mm or less, or 3.0 mm or less, or 2.5 mm. Below, or 2.0 mm or less, or 1.5 mm or less, or 1.0 mm or less, or 0.5 mm or less, or 0.3 mm or less, or 0.1 mm or less.

Example 42 is any one of the preceding or subsequent embodiments, further comprising processing a second rolled aluminum alloy product to form a finished aluminum alloy product.

Example 43 is any preceding or subsequent exemplary method, the treatment comprising one or more processes selected from the group consisting of annealing, solution formation, quenching, aging, and coiling.

Example 44 is any preceding or subsequent exemplary method, in which the finished aluminum alloy product is an aluminum alloy sheet in T6 or T7 tempering.

Example 45 is an aluminum alloy article, which is a second rolled aluminum alloy product formed by any one of the preceding or subsequent embodiments.

Example 46 is an aluminum alloy article, which is a finished aluminum alloy product formed by any one of the preceding or subsequent embodiments.

Example 47 is a manufactured article, which is composed of any one of the preceding or subsequent examples of an aluminum alloy article.

Example 48 is any preceding or subsequent exemplary manufactured article, which is a component, bridge, pipe for an automobile, truck, trailer, train, railroad vehicle, airplane, body panel, or any of the aforementioned. Lines, pipes, tubes, boats, ships, storage containers, storage tanks, furniture, windows, doors, railings, functional or decorative buildings, pipe railings, electrical components, conduits, beverage containers, food containers, or foil Is.

Example 49 is any preceding or subsequent exemplary manufactured article, which is an automobile body part.

Example 50 is any preceding or subsequent exemplary manufactured article, the vehicle body part being a power vehicle body part.

Example 51 is any preceding or subsequent exemplary manufactured article, wherein the power vehicle body parts include bumpers, side beams, roof beams, cross beams, pillar reinforcements, inner panels, outer panels, side panels, inner hoods, etc. Outer hood or trunk lid panel.

Example 52 is any preceding or subsequent exemplary manufactured article, which is the housing of the electronic device.

Example 53 is any preceding or subsequent exemplary manufactured article, which is an aerospace body component.

Example 54 is any preceding or subsequent exemplary manufactured article, where the aerospace body component is a structural body component.

Example 55 is any preceding or subsequent exemplary manufactured article, the structural body component being a wing, fuselage, aileron, rudder, elevator, cowling, or support.

Example 56 is any preceding or subsequent exemplary manufactured article, where the aerospace body component is a non-structural body component.

Example 57 is any preceding or subsequent exemplary manufactured article, the non-structural body component being a seat track, seat frame, panel, or hinge.

Example 58 is a method for producing an aluminum alloy article, in which the method is to cast an aluminum alloy to form an aluminum alloy cast product and homogenize the aluminum alloy cast product to obtain a homogenized aluminum alloy cast product. Forming and subjecting the homogenized aluminum alloy cast product to a first rolling process to form a first rolled aluminum alloy product with a first thickness, the first rolling process is: Forming, including one or more hot rolling passes, followed by one or more cold rolling passes, and the first rolled aluminum alloy product at a temperature that is 50 ° C or less above the minimum recrystallization temperature of the aluminum alloy. It is annealed to form a first annealed aluminum alloy product and the first annealed aluminum alloy product is subjected to a second rolling process to form a second rolled aluminum alloy product having a second thickness. Including to do.

Example 59 is any preceding or subsequent exemplary method, in which the aluminum alloy is a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy.

Example 60 is any preceding or subsequent exemplary method, with a first thickness of 10 mm or less.

Example 61 is any preceding or subsequent exemplary method, in which annealing is performed at a temperature above the minimum recrystallization temperature within 3.0 hours.

Example 62 is any preceding or subsequent exemplary method, in which the annealing is at a first temperature above the minimum recrystallization temperature over the first period and above the minimum recrystallization temperature over the second period. The first temperature above the minimum recrystallization temperature is higher than the second temperature above the minimum recrystallization temperature.

Example 63 is any preceding or subsequent exemplary method, with a second thickness of 4.0 mm or less.

Example 64 is any preceding or subsequent exemplary method, wherein the second rolled aluminum alloy product is a first surface portion, wherein the first surface portion comprises a first rolled surface. The surface portion 1 is a first surface portion having a first recrystallization ratio and a second surface portion facing the first surface portion, and the second surface portion is a second rolling. The second surface portion, including the surface, is an intermediate portion located between the second surface portion and the first surface portion and the second surface portion, which has a second recrystallization ratio. The intermediate portion comprises an intermediate portion having a third recrystallization ratio, and the third recrystallization ratio is lower than the first recrystallization ratio and / or the second recrystallization ratio.

Example 65 is any preceding or subsequent exemplary method, in which the first recrystallization ratio is 0.50 to 1.0 or the second recrystallization ratio is 0.50 to 1.0. Or, the third recrystallization ratio is 0.01 to 0.65.

Example 66 is an aluminum alloy article containing an aluminum alloy material, wherein the aluminum alloy material is a first surface portion, the first surface portion includes a first rolled surface, and the first surface portion is , A first surface portion having a first recrystallization ratio and a second surface portion facing the first surface portion, wherein the second surface portion includes a second rolled surface and is second. The second surface portion is an intermediate portion located between the second surface portion and the first surface portion and the second surface portion having a second recrystallization ratio, and the intermediate portion is the first. The third recrystallization ratio is lower than the first recrystallization ratio, the second recrystallization ratio, or both, including an intermediate portion having a recrystallization ratio of 3.

Example 67 is any preceding or subsequent exemplary aluminum alloy article, the aluminum alloy material being a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy.

Example 68 is any preceding or subsequent exemplary aluminum alloy article, one or both of the first rolled surface and the second rolled surface being formed by a process involving cold rolling.

Example 69 is any preceding or subsequent exemplary aluminum alloy article, wherein the first surface portion is a first, less than or equal to 40.0% of the thickness of the aluminum alloy article, from the surface of the first surface portion. It extends to the depth.

Example 70 is any preceding or subsequent exemplary aluminum alloy article, wherein the second surface portion is a second surface portion of the second surface portion that is 40.0% or less of the thickness of the aluminum alloy article. It extends to the depth.

Example 71 is any preceding or subsequent exemplary aluminum alloy article, the intermediate portion extending from a first depth of the first surface portion to a second depth of the second surface portion.

Example 72 is any preceding or subsequent exemplary aluminum alloy article, the first surface portion having a first recrystallization ratio and the second surface portion having a second recrystallization ratio. However, the intermediate portion has a third recrystallization ratio, and the third recrystallization ratio is lower than the first recrystallization ratio and / or the second recrystallization ratio.

Example 73 is any preceding or subsequent exemplary aluminum alloy article, having a first recrystallization ratio of at least 0.50, a second recrystallization ratio of at least 0.50, or a second. The recrystallization ratio of 3 is 0.65 or less.

Example 74 is any preceding or subsequent exemplary aluminum alloy article, having a β angle of 100 ° to 138 ° for bendability testing by Specification VDA238-100.

Example 75 is any preceding or subsequent exemplary aluminum alloy article, which has an EA exfoliation corrosion score for the exfoliation corrosion test according to ASTM test number G34-01.

Example 76 is any preceding exemplary aluminum alloy article in which the recrystallization ratio is a surface portion or surface portion to be recrystallized relative to the total amount, total volume, or total mass of a portion of the aluminum alloy material. Corresponds to the proportion or partial amount, partial volume, or partial mass of a portion of the aluminum alloy material, such as the intermediate portion.

All patents, patent applications, publications, and abstracts cited above are incorporated herein by reference in their entirety. Various embodiments of the present invention have been described to achieve various objects of the present invention. It should be recognized that these embodiments are merely exemplary of the principles of the invention. Many of these modifications and their conformances, which do not deviate from the spirit and scope of the invention as defined in the claims below, will be readily apparent to those skilled in the art.

Claims (20)

A method for manufacturing aluminum alloy articles.
Casting aluminum alloys to form aluminum alloy casting products,
By homogenizing the aluminum alloy casting product to form a homogenized aluminum alloy casting product,
The homogenized aluminum alloy casting product is subjected to a first rolling process to form a first rolled aluminum alloy product having a first thickness, wherein the first rolling process is one or more. To include a hot rolling pass followed by one or more cold rolling passes,
The first rolled aluminum alloy product is annealed at a temperature higher than the minimum recrystallization temperature of the aluminum alloy by 50 ° C. or less to form the first annealed aluminum alloy product.
A method comprising subjecting the first annealed aluminum alloy product to a second rolling process to form a second rolled aluminum alloy product having a second thickness. The method according to claim 1, wherein the aluminum alloy is a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy. The method according to claim 1, wherein the first thickness is 10 mm or less. The method of claim 1, wherein the annealing is performed at a temperature above the minimum recrystallization temperature for 3.0 hours or less. The annealing is performed at a first temperature above the minimum recrystallization temperature over a first period and at a second temperature above the minimum recrystallization temperature over a second period, the minimum recrystallization temperature. The method of claim 1, wherein the first temperature above is higher than the second temperature above the minimum recrystallization temperature. The method according to claim 1, wherein the second thickness is 4.0 mm or less. The second rolled aluminum alloy product is
A first surface portion, wherein the first surface portion comprises a first rolled surface and the first surface portion has a first recrystallization ratio.
A second surface portion facing the first surface portion, wherein the second surface portion includes a second rolled surface, and the second surface portion has a second recrystallization ratio. , The second surface part,
An intermediate portion located between the first surface portion and the second surface portion, the intermediate portion has a third recrystallization ratio, and the third recrystallization ratio is the first. The method of claim 1, comprising an intermediate portion, which is lower than one recrystallization ratio or at least one of the second recrystallization ratios. The first recrystallization ratio is 0.50 to 1.0, the second recrystallization ratio is 0.50 to 1.0, or the third recrystallization ratio is 0.01. The method according to claim 7, wherein the method is ~ 0.65. The first surface portion extends from the first surface of the first surface portion to a first depth of less than 40% of the thickness of the second rolled aluminum alloy product, said second. The method of claim 7, wherein the surface portion extends from the second surface of the second surface portion to a second depth of less than 40% of the thickness of the second rolled aluminum alloy product. .. An aluminum alloy article containing an aluminum alloy material, wherein the aluminum alloy material is
A first surface portion, wherein the first surface portion comprises a first rolled surface and the first surface portion has a first recrystallization ratio.
A second surface portion facing the first surface portion, wherein the second surface portion includes a second rolled surface, and the second surface portion has a second recrystallization ratio. , The second surface part,
An intermediate portion located between the first surface portion and the second surface portion, the intermediate portion has a third recrystallization ratio, and the third recrystallization ratio is the first. An aluminum alloy article comprising an intermediate portion, which is lower than one recrystallization ratio or at least one of the second recrystallization ratios. The aluminum alloy article according to claim 10, wherein the aluminum alloy material is a 5xxx series aluminum alloy, a 6xxx series aluminum alloy, or a 7xxx series aluminum alloy. The aluminum alloy article according to claim 10, wherein one or both of the first rolled surface and the second rolled surface are formed by a process including cold rolling. The aluminum alloy article according to claim 10, wherein the first surface portion extends from the surface of the first surface portion to a first depth of 40.0% or less of the thickness of the aluminum alloy article. .. The aluminum alloy according to claim 13, wherein the second surface portion extends from the surface of the second surface portion to a second depth of 40.0% or less of the thickness of the aluminum alloy article. Goods. The aluminum alloy article according to claim 10, wherein the intermediate portion extends from a first depth of the first surface portion to a second depth of the second surface portion. The first surface portion has a first recrystallization ratio, the second surface portion has a second recrystallization ratio, and the intermediate portion has a third recrystallization ratio. , The third recrystallization ratio is lower than at least one of the first recrystallization ratio or the second recrystallization ratio, and the recrystallization ratio of the aluminum alloy material to be recrystallized. The aluminum alloy article according to claim 10, which corresponds to the partial proportion or partial amount, partial volume, or partial mass of the aluminum alloy material as compared to a partial total amount, total volume, or total mass. Claim that the first recrystallization ratio is at least 0.50, the second recrystallization ratio is at least 0.50, or the third recrystallization ratio is 0.65 or less. The aluminum alloy article according to 16. The aluminum alloy article according to claim 10, which has a β angle of 100 ° to 138 ° with respect to a bendability test according to the Specification VDA238-100. The aluminum alloy article according to claim 10, which has an EA peel corrosion score for a peel corrosion test according to ASTM test number G34-01. The first surface portion extends from the first surface of the first surface portion to a first depth of less than 40% of the thickness of the aluminum alloy article, and the second surface portion extends. The aluminum alloy article according to claim 10, which extends from the second surface of the second surface portion to a second depth of less than 40% of the thickness of the aluminum alloy article.

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