KR20120135546A - Method for manufacturing scandium added aluminum alloys using solution treatment and natural aging method for the enhancement of strength and elongation of the same - Google Patents
Method for manufacturing scandium added aluminum alloys using solution treatment and natural aging method for the enhancement of strength and elongation of the same Download PDFInfo
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- KR20120135546A KR20120135546A KR1020110054318A KR20110054318A KR20120135546A KR 20120135546 A KR20120135546 A KR 20120135546A KR 1020110054318 A KR1020110054318 A KR 1020110054318A KR 20110054318 A KR20110054318 A KR 20110054318A KR 20120135546 A KR20120135546 A KR 20120135546A
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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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- 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
- C22F1/053—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 zinc as the next major constituent
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Abstract
Provided is a method for preparing a scandium-added aluminum alloy comprising a solution treatment and a natural aging step for increasing the strength and elongation of the scandium-added aluminum alloy.
Scandium-added aluminum alloy manufacturing method according to the present invention is a scandium-added aluminum alloy manufacturing method is the recrystallization fraction after the casting and homogenization treatment step of Al-Zn- (Mg)-(Cu)-(Zr)-(Ti) -Sc alloy and a solution treatment step to control the amount of vacancy-cluster production and to increase the elongation; And it is characterized in that it comprises a natural aging step for increasing the strength by being precipitated in the GP zone while maintaining at room temperature, according to the present invention, the process is a certain level without omitting the artificial aging step compared to the general aluminum aging process The required strength and elongation can be obtained.
Description
The present invention relates to a manufacturing process that can increase the strength and elongation by maintaining a certain time (natural aging) at room temperature after the solution treatment without undergoing an artificial aging treatment step in the scandium-added aluminum alloy manufacturing process.
In recent years, the unstable situation of oil prices has required the weight reduction of various transportation equipment, and aluminum alloys to meet this demand increasingly high strength. In particular, A7000 series alloys, in which zinc is a major additive element, are mainly used for aircraft parts or missile structures. In this field of application, attention is focused on lightweighting, and thus the demand for high-strength aluminum alloys will increase. However, since the 7000 series aluminum alloy is a precipitation hardening alloy, a certain level of strength can be obtained after a aging treatment process after a solution treatment. Therefore, there is a disadvantage in that the cost burden due to heat treatment increases.
The problem to be solved by the present invention has been devised to solve the above problems, in the precipitation hardening alloy to obtain a synergistic effect of strength and elongation only through the solution treatment step and the natural aging step without going through the artificial aging step It is proposed a process that can.
In order to solve the above problems, the present invention controls the recrystallization fraction and the amount of vacancy-cluster generated after the casting and homogenizing step of Al-Zn- (Mg)-(Cu)-(Zr)-(Ti) -Sc alloy Solution treatment step for increasing elongation; And it provides a method for producing a scandium-added aluminum alloy comprising a natural aging step for increasing the strength by being precipitated in the G.P zone while maintaining at room temperature.
As described above, according to the present invention, the present process can obtain a required level of strength and elongation even if the artificial aging step is omitted as compared with the general aluminum aging process. Extruded materials have a tensile strength of 650 MPa elongation of 16% and forging materials have a tensile strength of 600 MPa and elongation of 17%. For reference, the tensile strength, yield strength, and elongation requirements for 7075 alloy artificial aging (T6) treated materials are 559 MPa, 500 MPa, and 7% for extruded materials, and 510 MPa, 431 MPa, and 7% for forged materials, respectively. Therefore, when a material of such strength and elongation is required, the use of the alloy according to this process can reduce the time and cost required by performing the existing artificial aging process. It is possible to design strength and elongation by solution treatment and room temperature aging process control.
1 is a schematic diagram of a process for increasing strength and elongation by recrystallization fraction control and natural aging treatment,
2 is a view illustrating recrystallization after solution treatment of a scandium-added aluminum alloy;
3 is the hardness increase by natural aging after the solution treatment of the scandium-added aluminum alloy,
4 is an analysis of the correlation between the generation of GP zone and the increase in strength according to the natural aging time,
5 is the change in yield strength and elongation according to the recrystallization fraction,
6 is a graph comparing mechanical properties of aluminum 7075 products and alloys prepared according to the present process.
The present invention for achieving the above technical problem is controlled by the solution treatment in the Al-Zn-Mg- (Cu) -Sc alloy in the temperature range of 400 ~ 500 ℃ to generate a recrystallization of about 50 ~ 80%, After securing 15% or more of elongation, and then through a natural aging process, to control the GP zone to be generated in the Vacancy-cluster. In addition, quenching was used for water quenching, and the conditions were optimized to allow sufficient natural aging to occur at room temperature in the temperature range of 20 to 40 ℃ for more than 30 hours. This invention process is described in detail below with reference to the accompanying drawings, preferred embodiments of the present invention.
Figure 1 is a schematic process diagram of the process of the present invention is subjected to the process of the solution treatment-spontaneous aging of the product after the secondary processing, such as extrusion or forging, using a product that has been cast and homogenized.
2 is a view showing the recrystallized region generated in the solution treatment step in this process. Through the solution treatment in the temperature range proposed by the present invention, the recrystallization fraction of the proper ratio is controlled and thus the elongation is secured.
3 is a diagram showing the change in hardness according to the natural aging time, where A alloy: Al-7Zn-2Mg-Cu-0.05Sc, B alloy: Al-7Zn-2Mg-Cu-0.1Sc, C alloy: Al- It was a composition ratio of 7Zn-2Mg-Cu-0.2Sc.
Referring to FIG. 3, when the amount of scandium was tested based on three different alloys, hardness of the three alloys tended to increase as the time maintained at room temperature increased. This increasing tendency was observed to remain constant around 70 hours. Therefore, the natural aging of the alloy of the present invention can be attained at an appropriate strength at least 70 hours at room temperature.
Figure 4 is a graph measuring the hardness change during the DSC (Differential Scanning Calorymeter) thermal analysis and natural aging in order to analyze the relationship between the generation and hardness of GP zone during natural aging. Where H q : enthalpy change due to GP zone formation after water cooling, H t : enthalpy change due to GP zone generation after room temperature aging, ΔH v : hardness of alloy after room temperature aging for t hour-hardness of alloy after water cooling .
Referring to the results of FIG. 4, as the room temperature aging time is increased, the G.P zone formation enthalpy decreases as the room temperature aging time increases, and the hardness increases.
5 is a graph showing the change in yield strength and elongation according to the recrystallization fraction.
Referring to FIG. 5, it can be seen that the elongation increases as the natural aging time elapses.
6 is a graph showing the strength and elongation of the natural aging treatment material after the solution treatment of the extruded and forged material produced through the process of the present invention.
Referring to FIG. 6, the strength and elongation characteristics of the materials manufactured according to this process step using Al-Zn-Mg-Cu-Sc alloys are usually measured after the final T6 treatment (artificial aging treatment) of commercially available 7000 series alloys. The properties and yield strengths are similar, but very good in terms of elongation. In particular, the present invention has the advantage that can be used without going through the artificial aging step by securing the appropriate strength and elongation through the solution treatment and natural aging treatment without going through the artificial aging step.
Herein, the present invention described above has been described with reference to a preferred embodiment, but those skilled in the art will variously modify the present invention without departing from the technical matters and scope of the present invention as set forth in the claims below. And can be changed.
Claims (4)
Method for producing a scandium-added aluminum alloy, characterized in that it comprises a natural aging step to increase the strength by being deposited in the GP zone while maintaining at room temperature.
The solution treatment step is a scandium-added aluminum alloy manufacturing method, characterized in that the solution is subjected to a solution treatment in the temperature range of 300 to 550 ℃ for supersaturated solid solution and recrystallization fraction control.
The natural aging process is a scandium-added aluminum alloy manufacturing method, characterized in that proceed for 1 to 200 hours at room temperature in the range of 20 to 50 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110054318A KR20120135546A (en) | 2011-06-07 | 2011-06-07 | Method for manufacturing scandium added aluminum alloys using solution treatment and natural aging method for the enhancement of strength and elongation of the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110054318A KR20120135546A (en) | 2011-06-07 | 2011-06-07 | Method for manufacturing scandium added aluminum alloys using solution treatment and natural aging method for the enhancement of strength and elongation of the same |
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| KR20120135546A true KR20120135546A (en) | 2012-12-17 |
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Cited By (8)
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| CN107385291A (en) * | 2017-06-22 | 2017-11-24 | 烟台南山学院 | A kind of high-performance Al Zn Mg Cu Zr Ce Ti alloys and its preparation technology |
| CN107675044A (en) * | 2017-09-26 | 2018-02-09 | 辽宁忠旺集团有限公司 | A kind of aviation alloyed aluminium section bar and its production technology |
| WO2018063857A1 (en) * | 2016-09-30 | 2018-04-05 | Honeywell International Inc. | High strength aluminum alloy backing plate and methods of making |
| US10253403B2 (en) | 2013-10-24 | 2019-04-09 | Korea Institute Of Machinery And Materials | Method of manufacturing grain-refined aluminum-zinc-magnesium-copper alloy sheet |
| CN110527881A (en) * | 2019-04-23 | 2019-12-03 | 华南理工大学 | It is a kind of quickly to solidify high-performance high zinc content Al-Zn-Mg-Cu-Zr alloy and preparation method thereof |
| CN111705274A (en) * | 2020-06-15 | 2020-09-25 | 北京科技大学 | Processing method of Al-Zn-Mg- (Cu) alloy material |
| CN113278900A (en) * | 2020-02-20 | 2021-08-20 | 核工业理化工程研究院 | Solid solution treatment method of Al-Zn-Mg-Cu series high-strength aluminum alloy |
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- 2011-06-07 KR KR1020110054318A patent/KR20120135546A/en not_active Application Discontinuation
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| US10253403B2 (en) | 2013-10-24 | 2019-04-09 | Korea Institute Of Machinery And Materials | Method of manufacturing grain-refined aluminum-zinc-magnesium-copper alloy sheet |
| US11359273B2 (en) | 2015-08-03 | 2022-06-14 | Honeywell International Inc. | Frictionless forged aluminum alloy sputtering target with improved properties |
| WO2018063857A1 (en) * | 2016-09-30 | 2018-04-05 | Honeywell International Inc. | High strength aluminum alloy backing plate and methods of making |
| US10900102B2 (en) | 2016-09-30 | 2021-01-26 | Honeywell International Inc. | High strength aluminum alloy backing plate and methods of making |
| CN107385291A (en) * | 2017-06-22 | 2017-11-24 | 烟台南山学院 | A kind of high-performance Al Zn Mg Cu Zr Ce Ti alloys and its preparation technology |
| CN107675044A (en) * | 2017-09-26 | 2018-02-09 | 辽宁忠旺集团有限公司 | A kind of aviation alloyed aluminium section bar and its production technology |
| CN110527881A (en) * | 2019-04-23 | 2019-12-03 | 华南理工大学 | It is a kind of quickly to solidify high-performance high zinc content Al-Zn-Mg-Cu-Zr alloy and preparation method thereof |
| CN110527881B (en) * | 2019-04-23 | 2021-10-01 | 华南理工大学 | Fast-solidification high-performance high-zinc-content Al-Zn-Mg-Cu-Zr alloy and preparation method thereof |
| CN113278900A (en) * | 2020-02-20 | 2021-08-20 | 核工业理化工程研究院 | Solid solution treatment method of Al-Zn-Mg-Cu series high-strength aluminum alloy |
| CN113278900B (en) * | 2020-02-20 | 2022-05-06 | 核工业理化工程研究院 | Solid solution treatment method of Al-Zn-Mg-Cu series high-strength aluminum alloy |
| CN111705274A (en) * | 2020-06-15 | 2020-09-25 | 北京科技大学 | Processing method of Al-Zn-Mg- (Cu) alloy material |
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