Method for improving the fatigue resistance performance of Al-Cu-Mg alloy

An al-cu-mg, anti-fatigue technology, which is applied in the processing of Al-Cu-Mg alloys to improve the anti-fatigue performance of Al-Cu-Mg alloys, and can solve the problems of cost, inconvenience in industrial production, and low density of Gauss texture. problem, to achieve the effect of simple and reasonable process and high fatigue resistance

Active Publication Date: 2014-02-19
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The emergence of these processes can improve the fatigue resistance of this type of alloy to a certain extent, but the obtained Gaussian texture density is generally relatively low, and there is still a large room for improvement
In addition, these technical processes are relatively complicated, require more energy consumption, and are extremely inconvenient for industrial production.

Method used

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  • Method for improving the fatigue resistance performance of Al-Cu-Mg alloy
  • Method for improving the fatigue resistance performance of Al-Cu-Mg alloy
  • Method for improving the fatigue resistance performance of Al-Cu-Mg alloy

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Effect test

Embodiment 1

[0041] The alloy composition is: 3.8%Cu, 1.0%Mg, 0.3%Mn, and the balance of Al Al-Cu-Mg alloy is homogenized. After the ingot is kept at 430℃ for 1 hour, it is directly hot rolled with 70% deformation. Then, it was subjected to air solution treatment at 470°C for 1 hour and then subjected to 80% deformation cold rolling, and then subjected to 470°C salt bath solution treatment for 20 minutes and natural aging treatment after water quenching. The tensile strength is 456MPa, the yield strength is 327MPa, and the elongation is 23%. When the stress expansion factor ΔK=33MPa*m 1 / 2 When, the expansion rate of the alloy is 0.00595mm / cycle respectively.

Embodiment 2

[0043] The alloy composition is: 4.4% Cu, 1.3% Mg, 0.45% Mn, and the balance of Al Al-Cu-Mg alloy is homogenized. After the ingot is kept at 440°C for 1 hour, it is directly hot rolled with 70% deformation. After that, it is cold rolled with 80% deformation, and then annealed at 400°C for 1h, and then treated again with 490°C salt bath solution for 20 minutes and natural aging treatment after water quenching. The tensile strength is 476MPa, the yield strength is 334MPa, and the elongation is 23.2%. When the stress expansion factor ΔK=33MPa*m 1 / 2 When, the expansion rate of the alloy is 0.00335mm / cycle respectively.

Embodiment 3

[0045] The alloy composition is: 4.9% Cu, 1.5% Mg, 0.8% Mn, the balance of Al Al-Cu-Mg alloy is homogenized, the ingot is directly hot rolled with 70% deformation after 1 hour at 440°C, Then, air solution treatment was carried out at 490°C for 1 hour and then subjected to 80% deformation cold rolling, and then again subjected to 490°C salt bath solution treatment for 20 minutes after natural aging treatment. The tensile strength is 475MPa, the yield strength is 331MPa, and the elongation is 22.3%. When the stress expansion factor ΔK=33MPa*m 1 / 2 When, the expansion rate of the alloy is 0.0043mm / cycle respectively.

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Abstract

A method for improving the fatigue resistance performance of Al-Cu-Mg alloy is to perform high-temperature hot rolling, primary solution treatment, large deformation cold rolling, secondary solution treatment and natural aging treatment to homogenized aluminium alloy in sequence. According to the invention, relatively high temperature is kept before hot rolling, and then a material recrystallizes dynamically during the hot rolling process, so that a plurality of recrystallization textures such as Goss and Cube are formed, and the fatigue resistance performance of the aluminium alloy can be improved advantageously; solution treatment before cold rolling can greatly eliminate large second-phase particles except for impurities such as Fe and Si to prevent a high energy region from forming, so that uneven recrystallization can be avoided; after large deformation cold rolling deformation is performed, the dislocation density of the alloy is greatly improved, the alloy can obtain more stored energy, the recrystallization nucleation rate is increased during solution treatment, fine crystal grains can be formed, and the fatigue resistance performance of the aluminium alloy can be improved further. The process method provided by the invention is simple, convenient in operation, economical in cost and suitable for industrialized application.

Description

Technical field [0001] The invention relates to an Al-Cu-Mg alloy processing method, in particular to a method for improving the fatigue resistance of the Al-Cu-Mg alloy; it belongs to the technical field of non-ferrous metal processing technology. technical background [0002] Al-Cu-Mg series alloys are precipitation hardening aluminum alloys widely used in aerospace due to their medium strength, good toughness and excellent fatigue resistance. They are especially often used as aircraft skin materials and are extremely important in the aviation field. Status. However, the rapid development of composite materials in recent years has brought greater impact to aluminum alloys, so it is of great significance to further improve the fatigue properties of the aluminum alloys. [0003] Studies have shown that, in view of the improvement of the fatigue resistance of the aluminum alloy, researches have been mainly carried out on such aspects as alloy impurity elements, atomic cluster size,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057
Inventor 刘志义李福东夏鹏鲁璐青应普友
Owner CENT SOUTH UNIV
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