CN115821132A - Aluminum alloy and preparation method thereof - Google Patents
Aluminum alloy and preparation method thereof Download PDFInfo
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- CN115821132A CN115821132A CN202211489897.XA CN202211489897A CN115821132A CN 115821132 A CN115821132 A CN 115821132A CN 202211489897 A CN202211489897 A CN 202211489897A CN 115821132 A CN115821132 A CN 115821132A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 135
- 238000002360 preparation method Methods 0.000 title description 4
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 50
- 238000010438 heat treatment Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 19
- 230000032683 aging Effects 0.000 claims description 17
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005242 forging Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 229910045601 alloy Inorganic materials 0.000 description 17
- 239000000956 alloy Substances 0.000 description 17
- 238000007670 refining Methods 0.000 description 13
- 239000000243 solution Substances 0.000 description 10
- 238000003723 Smelting Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 239000007769 metal material Substances 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000007546 Brinell hardness test Methods 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002354 inductively-coupled plasma atomic emission spectroscopy Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/18—Alloys based on aluminium with copper as the next major constituent with zinc
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention relates to an aluminum alloy comprising the following elements, in mass%, cu:4.4 to 4.7, li:2.5 to 2.6, mg:0.8 to 1.0, zn:0.8 to 1.0, zr:0.2 to 0.25, sc:0.8 to 0.15, and the balance of Al and inevitable impurities. The aluminum alloy has low density, good comprehensive mechanical property, good forming and processing properties and higher weldability. On the same strength level, the aluminum alloy can be used on the concrete pump truck arm frame to replace steel.
Description
Technical Field
The invention belongs to the technical field of alloys, and particularly relates to an aluminum alloy and a preparation method thereof.
Background
At present, the boom of a concrete pump truck is made of steel materials such as Q460, Q550, Q690 and BS700. The density of the steel is high, generally 7.85g/cm 3 On the left and right sides, therefore, the steel arm support is generally heavier, and therefore, the concrete pump truck has a series of problems of large load, large discharge amount, limited listing and the like. In order to solve the above problems, the weight of the arm support needs to be reduced.
Aluminum alloys are a most widely used class of non-ferrous metal materials and are used in a large number of industries such as aviation, aerospace, automotive, machine manufacturing, marine and the like. The aluminum alloys have a relatively low density, typically 2.7g/cm 3 About, one third of the steel density. The arm support with the same structure uses aluminum under the same strengthThe alloy replaces steel, and the weight of the arm support can be obviously reduced.
Aiming at the structural part of the arm support, the aluminum alloy is used for replacing steel, and the following advantages are achieved: (1) the aluminum alloy has low density; (2) the formability is good: the required part shape can be directly cast by casting, and the transformation to a complex structure can be realized by plastic deformation; (3) the weldability is good: the welding method of the aluminum alloy is various, such as arc welding, friction stir welding, laser welding and the like, and can meet the manufacturing requirement of large-size aluminum alloy parts.
In the prior art, 6XXX series and 7XXX series aluminum alloys are generally adopted as structural materials of the arm support. The 6XXX series aluminum alloy has good forming performance, but the overall strength is lower and is less than 350MPa; while the 7XXX series aluminum alloy has high strength, the difficulty of preparing large-size variable cross-section sectional materials through plastic forming and extrusion forming is high. Therefore, the material of the aluminum alloy needs to be further optimized to obtain the light and high-strength aluminum alloy so as to meet the requirements of the concrete pump truck on the use working conditions.
Disclosure of Invention
The invention provides an aluminum alloy, which comprises the following elements in percentage by mass, cu:4.4 to 4.7, li:2.5 to 2.6, mg:0.8 to 1.0, zn:0.8 to 1.0, zr:0.2 to 0.25, sc:0.8 to 0.15, and the balance of Al and inevitable impurities.
In one embodiment, the yield strength of the aluminum alloy is more than or equal to 500MPa, the tensile strength is more than or equal to 625MPa, the elongation after fracture is more than or equal to 16.5 percent, and the overall hardness is more than or equal to 155HBW. In one embodiment, the aluminum alloy has an elongation after fracture of greater than or equal to 17%. In one embodiment, the aluminum alloy has an overall hardness of 158HBW or greater.
In one embodiment, the aluminum alloy has a yield strength of 500MPa or more, a tensile strength of 625MPa or more, an elongation after fracture of 17% or more, and an overall hardness of 158HBW or more.
In one embodiment, the aluminum alloy has a density of 2.6g/cm or less 3 。
The invention also provides products containing the aluminum alloy. In one embodiment, the product is a rolled, extruded or forged product.
The invention also provides a structural part containing the aluminum alloy or the product. In one embodiment, the structural component is a boom, such as a boom of a concrete pump truck.
The invention also provides a concrete pump truck containing the aluminum alloy, the product or the structural component.
The present invention also provides a method of manufacturing an aluminum alloy product, comprising:
1) Preparing an aluminium alloy casting comprising the following elements, in mass%, cu:4.4 to 4.7, li:2.5 to 2.6, mg:0.8 to 1.0, zn:0.8 to 1.0, zr:0.2 to 0.25, sc:0.8 to 0.15, and the balance of Al and unavoidable impurities, optionally, rolling, extruding or forging the aluminum alloy casting;
2) Subjecting an aluminum alloy casting to a solution treatment comprising: heating the aluminum alloy casting to 490-505 ℃, and preserving heat for 5.5-6.5 hours;
3) Quenching the aluminum alloy casting;
4) Subjecting an aluminum alloy casting to an aging treatment, wherein the aging treatment comprises: heating the aluminum alloy casting to 172-178 ℃, and preserving heat for 16.5-17 hours.
In one embodiment, the solution treatment comprises: heating the aluminum alloy casting to 495-505 ℃, and preserving heat for 5.5-6.5 hours.
In one embodiment, the solution treatment comprises: heating the aluminum alloy casting to 500 ℃, and preserving heat for 5.5-6.5 hours.
In one embodiment, the solution treatment comprises: heating the aluminum alloy casting to 500 ℃, and preserving heat for 6 hours.
In one embodiment, the aging treatment comprises: heating the aluminum alloy casting to 173-177 ℃, and preserving heat for 16.5-17 hours.
In one embodiment, the aging treatment comprises: heating the aluminum alloy casting to 174-176 ℃, and preserving heat for 16.5-17 hours.
In one embodiment, the aging treatment comprises: heating the aluminum alloy casting to 175 ℃, and preserving heat for 17 hours.
In one embodiment, step 2) includes extruding the aluminum alloy casting at 505 to 510 ℃.
In one embodiment, a method of making an aluminum alloy casting comprises:
1) According to the chemical composition, various intermediate ingots (such as high-purity Al ingots, al-Cu ingots, high-purity Mg ingots, high-purity lithium, al-Zr ingots and Al-Sc ingots) are melted, the high-purity Mg ingots are preferably added when the temperature reaches 700 ℃, and the high-purity lithium is preferably added when the temperature is raised to 720 ℃;
2) Adding refining agent (such as C) 2 Cl 6 ) Refining for at least 2 times, wherein the refining temperature is preferably 710-720 ℃;
3) And (3) casting and forming, preferably casting and forming at 715-720 ℃.
The invention also provides an aluminium alloy product obtained by the method for manufacturing an aluminium alloy product. In one embodiment, the alloy product is a hollow profile having a width of 20 to 50mm, a height of 20 to 50mm, a thickness of 5 to 10mm, and a length of 5m or more.
The invention also provides a structural component containing or made from the aluminum alloy product. In one embodiment, the structural component is a boom, such as a boom of a concrete pump truck.
The invention also provides a concrete pump truck containing the aluminum alloy product or the structural component.
In the present invention, a "structural component" refers to a mechanical part whose static and/or dynamic mechanical properties are particularly important for the performance of a structure and for which structural calculations are usually prescribed or carried out. These are typical components, the breakage of which can seriously threaten the safety of the mechanical structure. For concrete pump trucks, the structural components include the components that make up the boom.
Unless otherwise indicated, all information relating to the chemical composition of the alloy is expressed in weight percent based on the total weight of the alloy.
Unless otherwise stated, yield strength is according to GB/T228.1-2010 metallic Material tensile test part 1: room temperature test method.
Unless otherwise stated, tensile strength is according to GB/T228.1-2010 Metal Material tensile test part 1: room temperature test method.
Unless otherwise stated, elongation after break is according to GB/T228.1-2010 metallic material tensile test part 1: room temperature test method.
Unless otherwise stated, the bulk hardness is according to GB/T231.1-2018 metallic material Brinell hardness test part 1: test methods.
Unless otherwise stated, the metallographic microstructure was determined according to the GB/T13298-2015 metal microstructure test method.
Unless otherwise stated, alloy densities are determined According to ASD-STAN PREN 6018-1990Aerospace Series Test Methods for Metallic Materials Determination of sensitivity adjustment to display Method (Issue P1).
Unless otherwise indicated, the alloying element content is according to GB/T20975.25-2020 aluminium and aluminium alloy chemical analysis method part 25: determination of element content inductively coupled plasma atomic emission spectrometry.
The inventor finds that the aluminum alloy can obtain lower density by increasing the content of the Li element, but the excessive content of the Li element is easy to generate the burning loss of the Li element in the smelting process, the segregation phenomenon is easy to occur in the structure of the aluminum alloy after smelting, the strength of the aluminum alloy is reduced, and the plasticity of the aluminum alloy is deteriorated. The inventors have found that an aluminum alloy having a Cu content of 4.4 to 4.7 wt.%, a Li content of 2.5 to 2.6 wt.%, and a Mg content of 0.8 to 1.0 wt.% provides an aluminum alloy having satisfactory density and comprehensive mechanical properties including strength, hardness, and plasticity. The inventors have also found that an aluminum alloy having a Zr content of 0.2 to 0.25 wt.% and a Sc content of 0.8 to 0.15 wt.% provides the aluminum alloy with satisfactory grain refining effects, phase distribution, and overall properties including strength, hardness, and plasticity.
The aluminum alloy provided by the invention is a light and high-strength aluminum alloy, and the density of the aluminum alloy is less than or equal to 2.6g/cm 3 The yield strength is more than or equal to 500MPa, the tensile strength is more than or equal to 625MPa, andthe aluminum alloy also has good plasticity and hardness, the elongation after fracture is more than or equal to 16.5 percent, the integral hardness is more than or equal to 155HBW, and the comprehensive mechanical property is good.
The aluminum alloy has an average grain size of about 34.5 to 35.5 μm and the second phase is uniformly distributed within the grains and at the grain boundaries.
The aluminum alloy has good forming and processing performance and higher weldability.
On the same strength level, the aluminum alloy can be used on the concrete pump truck arm support to replace steel, so that the mechanical property use requirement of the arm support is met, the self weight of the arm support is obviously reduced, and the effects of energy conservation and emission reduction are achieved.
Drawings
FIG. 1 shows the metallographic structure of an aluminum alloy obtained in example 1 of the present invention;
FIG. 2 shows the metallographic structure of an aluminum alloy obtained in example 2 of the present invention;
FIG. 3 shows the metallographic structure of an aluminum alloy obtained in example 3 of the invention;
FIG. 4 shows the metallographic structure of an aluminum alloy obtained in example 4 of the invention;
FIG. 5 shows the metallographic structure of an aluminum alloy obtained in example 5 of the present invention;
figure 6 shows a hollow profile prepared according to example 6 of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The raw materials, equipment or instruments used are not indicated by manufacturers, and all the raw materials, equipment or instruments are conventional products which can be obtained commercially.
The aluminum alloy casting in the embodiment of the invention is prepared by the preparation method comprising the following steps:
(1) Smelting: preparing according to chemical components, putting various intermediate ingots (such as high-purity Al ingots, al-Cu ingots, high-purity Mg ingots, high-purity lithium, al-Zr ingots and Al-Sc ingots) into a smelting furnace for melting, wherein Mg is added when the temperature reaches 700 ℃, and lithium is added when the temperature is raised to 720 ℃.
(2) Refining: by introduction of refining agents, e.g. C 2 Cl 6 Refining at least for 2 times at 710-720 deg.C.
(3) Pouring: after refining, controlling the temperature of the melt, and casting and forming at 715-720 ℃.
The detection method used in the embodiment of the invention is as follows:
example 1
The aluminum alloy in this example has an element composition, calculated by mass fraction, of Cu:4.62%, li:2.57%, mg:0.98%, zr:0.23%, zn:0.21%, sc:0.13 percent and the balance of Al. The components of the alloy are proportioned, and then smelting, refining and pouring forming are carried out to obtain the aluminum alloy casting. And (2) carrying out solid solution treatment on the aluminum alloy casting by adopting a vacuum resistance furnace, heating to 500 ℃, preserving heat for 6h, taking out, carrying out water-cooling quenching, then carrying out aging treatment on the aluminum alloy casting in the vacuum resistance furnace, heating to 175 ℃, and preserving heat for 17h to obtain an aluminum alloy sample 1. And changing the temperature and the heat preservation time of the solution treatment and the aging treatment to obtain the aluminum alloy samples 2-5.
And (3) carrying out metallographic microstructure observation on the aluminum alloy sample obtained by the method, and detecting the mechanical performance parameters such as density, tensile strength, yield strength, elongation after fracture, hardness and the like.
The metallographic microstructure of the aluminum alloy sample 1 is shown in FIG. 1, the alloy has an average grain size of 34.6. Mu.m, and the second phase is uniformly distributed in the grain and at the grain boundaries. Aluminum alloy sample 1 had a density of 2.58g/cm 3 The tensile strength is 627MPa, the yield strength is 505MPa, the elongation after fracture is 17.0 percent, and the integral hardness range is 158-160 HBW. The mechanical properties of the aluminum alloy samples 2-5 are shown in Table 1.
TABLE 1 mechanical Property parameters of aluminum alloys obtained with different Heat treatment Process parameters
Example 2
The aluminum alloy in this example has an element composition, calculated by mass fraction, of Cu:4.39%, li:2.49%, mg:0.79%, zr:0.22%, zn:0.24%, sc:0.14 percent and the balance of Al. The components of the alloy are proportioned, and then smelting, refining and pouring forming are carried out to obtain the aluminum alloy casting. Carrying out solution treatment on the aluminum alloy casting by adopting a vacuum resistance furnace, heating to 500 ℃, preserving heat for 6h, taking out and then carrying out water-cooling quenching. And then carrying out aging treatment on the aluminum alloy casting in a vacuum resistance furnace, heating to 175 ℃, and keeping the temperature for 17h.
Metallographic microstructure observation was performed on the aluminum alloy samples obtained by the above method, as shown in fig. 2, the average grain size of the alloy was 35.4 μm, and the second phase was uniformly distributed in the grain interior and at the grain boundary. The density of the aluminum alloy sample was 2.58g/cm 3 The tensile strength is 606MPa, the yield strength is 490MPa, the elongation after fracture is 17.5%, and the whole hardness range is 155-157 HBW. It can be seen that the strength and hardness of the aluminum alloy sample are reduced with the reduction of the contents of Cu, li and Mg elements, but the plasticity is slightly improved.
Example 3
The aluminum alloy in this example has an element composition, calculated by mass fraction, of Cu:4.71%, li:2.61%, mg:1.01%, zr:0.23%, zn:0.22%, sc:0.11 percent and the balance of Al. The components of the alloy are proportioned, and then smelting, refining and pouring forming are carried out to obtain the aluminum alloy casting. And (3) carrying out solid solution treatment on the aluminum alloy casting by adopting a vacuum resistance furnace, heating to 500 ℃, preserving heat for 6 hours, taking out, and carrying out water-cooling quenching. And then carrying out aging treatment on the aluminum alloy casting in a vacuum resistance furnace, heating to 175 ℃, and keeping the temperature for 17h.
Metallographic microstructure observation was performed on the aluminum alloy samples obtained by the above method, as shown in fig. 3, the average grain size of the alloy was 35.3 μm, and the second phase was uniformly distributed in the grain interior and at the grain boundary. The density of the aluminum alloy sample was 2.59g/cm 3 Tensile strength of 645MPa and yield strength of 517MPa, elongation after fracture of 16.0 percent and integral hardness of 165-168 HBW. It can be seen that the strength and hardness of the aluminum alloy sample are obviously improved with the increase of the contents of Cu, li and Mg elements, but the plasticity is reduced.
Example 4
The aluminum alloy in this example has an element composition, calculated by mass fraction, of Cu:4.45%, li:2.57%, mg:0.92%, zr:0.19%, zn:0.26%, sc:0.07% and the balance of Al. The components of the alloy are proportioned, and then smelting, refining and pouring forming are carried out to obtain the aluminum alloy casting. Carrying out solution treatment on the aluminum alloy casting by adopting a vacuum resistance furnace, heating to 500 ℃, preserving heat for 6h, taking out and then carrying out water-cooling quenching. And then carrying out aging treatment on the aluminum alloy casting in a vacuum resistance furnace, heating to 175 ℃, and keeping the temperature for 17h.
Metallographic microstructure observation was performed on the aluminum alloy samples obtained by the above method, and as shown in fig. 4, the average grain size of the alloy was 47.6 μm, and the second phase was uniformly distributed in the grain interior and at the grain boundary. The density of the aluminum alloy sample was 2.58g/cm 3 The tensile strength is 586MPa, the yield strength is 462MPa, the elongation after fracture is 15.5 percent, and the integral hardness range is 140-148 HBW. As can be seen, along with the reduction of the Zr and Sc element contents, the grain refinement effect of the structure is reduced, and the strength, the hardness and the plasticity of the aluminum alloy sample are obviously reduced.
Example 5
The aluminum alloy in this example has an element composition, calculated by mass fraction, of Cu:4.42%, li:2.53%, mg:0.94%, zr:0.26%, zn:0.23%, sc:0.16% and the balance of Al. The components are mixed according to the alloy components, and then smelting, refining and pouring forming are carried out to obtain the aluminum alloy casting. Carrying out solution treatment on the aluminum alloy casting by adopting a vacuum resistance furnace, heating to 500 ℃, preserving heat for 6h, taking out and then carrying out water-cooling quenching. And then carrying out aging treatment on the aluminum alloy casting in a vacuum resistance furnace, heating to 175 ℃, and keeping the temperature for 17h.
Metallographic microstructure observation of the aluminum alloy sample obtained by the above method was carried out, and as shown in FIG. 5, the average grain size of the alloy was 31.2 μm, and the second phase was uniformly distributed in the grain interiorAt the grain boundaries. The density of the aluminum alloy sample was 2.58g/cm 3 The tensile strength is 618MPa, the yield strength is 492MPa, the elongation after fracture is 16.5 percent, and the integral hardness range is 154-157 HBW. It can be seen that as the content of Zr and Sc elements increases, the size of the precipitated phase at the grain boundary is larger, and the grain refinement effect of the structure is not much different from that of example 1, but the strength, hardness and plasticity of the aluminum alloy sample are slightly reduced.
Example 6
The alloy components in the embodiment 1 are mixed, then melted, refined and cast into a bar ingot, and the bar ingot is extruded, cooled by water and thermally treated by an aluminum extruder to prepare a hollow section with the width of 20-50 mm, the height of 20-50 mm, the thickness of 5-10 mm and the length of more than 5m (figure 6). During extrusion, the ingot casting temperature is controlled between 505 and 510 ℃. The process parameters of the heat treatment were the same as those of the aluminum alloy sample 1 in example 1. Carrying out solution treatment on the extruded aluminum alloy by using a vacuum resistance furnace, heating to 500 ℃, preserving heat for 6 hours, taking out, carrying out water-cooling quenching, then carrying out aging treatment on the extruded aluminum alloy in the vacuum resistance furnace, heating to 175 ℃, and preserving heat for 17 hours.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the invention, it is intended to cover all modifications within the scope of the invention as claimed.
Claims (20)
1. An aluminum alloy comprising the following elements, in mass%, cu:4.4 to 4.7, li:2.5 to 2.6, mg:0.8 to 1.0, zn:0.8 to 1.0, zr:0.2 to 0.25, sc:0.8 to 0.15, and the balance of Al and inevitable impurities.
2. The aluminum alloy of claim 1 having a yield strength of 500MPa or greater, a tensile strength of 625MPa or greater, an elongation after fracture of 16.5% or greater, and an overall hardness of 155HBW or greater.
3. The aluminum alloy of claim 2 having an elongation after fracture of greater than or equal to 17%.
4. A product comprising the aluminum alloy of any of claims 1-3.
5. The product of claim 4 which is a rolled, extruded or forged product.
6. Structural part comprising an aluminium alloy according to any one of claims 1 to 3 or a product according to claim 4 or 5.
7. The structural member of claim 6, wherein the structural member is a boom.
8. Concrete pump vehicle comprising an aluminium alloy according to any one of claims 1 to 3, a product according to claim 4 or 5 or a structural part according to claim 6 or 7.
9. A method of making an aluminum alloy product, comprising:
1) Preparing an aluminium alloy casting comprising the following elements, in mass%, cu:4.4 to 4.7, li:2.5 to 2.6, mg:0.8 to 1.0, zn:0.8 to 1.0, zr:0.2 to 0.25, sc:0.8 to 0.15, and the balance of Al and unavoidable impurities, optionally, rolling, extruding or forging the aluminum alloy casting;
2) Subjecting an aluminum alloy casting to a solution treatment comprising: heating the aluminum alloy casting to 490-505 ℃, and preserving heat for 5.5-6.5 hours;
3) Carrying out quenching treatment on the aluminum alloy casting;
4) Subjecting an aluminum alloy casting to an aging treatment, wherein the aging treatment comprises: heating the aluminum alloy casting to 172-178 ℃, and preserving heat for 16.5-17 hours.
10. The method of claim 9, wherein the solution treatment comprises: heating the aluminum alloy casting to 495-505 ℃, and preserving heat for 5.5-6.5 hours.
11. The method of claim 10, wherein the solution treatment comprises: heating the aluminum alloy casting to 500 ℃, and preserving the heat for 5.5-6.5 hours.
12. The method of claim 11, wherein the solution treatment comprises: heating the aluminum alloy casting to 500 ℃, and preserving heat for 6 hours.
13. The method of any of claims 9-12, wherein the aging treatment comprises: heating the aluminum alloy casting to 173-177 ℃, and preserving heat for 16.5-17 hours.
14. The method of claim 13, wherein the aging comprises: heating the aluminum alloy casting to 174-176 ℃, and preserving heat for 16.5-17 hours.
15. The method of claim 14, wherein the aging process comprises: the aluminum alloy casting is heated to 175 ℃ and kept warm for 17 hours.
16. The method of any one of claims 9-12, wherein prior to step 2), comprising extruding the aluminum alloy casting at a temperature of 505 to 510 ℃.
17. An aluminium alloy product obtainable by the method of any one of claims 9 to 16.
18. A structural component comprising the aluminum alloy product of claim 17 or made from the aluminum alloy product of claim 17.
19. The structural member of claim 18, wherein the structural member is a boom.
20. A concrete pump vehicle comprising the aluminum alloy product of claim 17 or the structural member of claim 18 or 19.
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| PCT/CN2023/075017 WO2023134780A1 (en) | 2022-11-25 | 2023-02-08 | Aluminum alloy and preparation method therefor |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06207254A (en) * | 1993-01-07 | 1994-07-26 | Arishiumu:Kk | Production of high strength al-li series alloy casting |
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| CN110423927A (en) * | 2019-07-17 | 2019-11-08 | 中南大学 | A kind of Ultrahigh strength aluminum lithium alloy and preparation method thereof |
| CN111996426A (en) * | 2020-08-30 | 2020-11-27 | 中南大学 | High-strength Al-Cu-Mg-Mn aluminum alloy and preparation method thereof |
| CN113981280A (en) * | 2021-11-01 | 2022-01-28 | 北京理工大学 | Low-density high-strength high-elasticity-modulus aluminum-lithium alloy and preparation method thereof |
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| RU2215805C2 (en) * | 2001-12-17 | 2003-11-10 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" | Aluminum-base alloy and article made of thereof |
| CN108823519B (en) * | 2018-07-02 | 2021-10-01 | 鼎镁新材料科技股份有限公司 | high-Mg-content medium-strength high-ductility aluminum-lithium alloy and heat treatment method thereof |
| CN110423926B (en) * | 2019-07-29 | 2020-12-29 | 中国航发北京航空材料研究院 | Heat-resistant aluminum-lithium alloy and preparation method thereof |
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| JPH06207254A (en) * | 1993-01-07 | 1994-07-26 | Arishiumu:Kk | Production of high strength al-li series alloy casting |
| CA2765382A1 (en) * | 2009-06-25 | 2010-12-29 | Constellium France | Aluminium-copper-lithium alloy having improved mechanical strength and improved toughness |
| CN105755409A (en) * | 2014-12-15 | 2016-07-13 | 中国航空工业集团公司北京航空材料研究院 | Heat treatment method for improving damage resistance of aluminum lithium alloy thin plate |
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