A Method of Improving the Fatigue Resistance of Al-cu-mg Alloy

An al-cu-mg, anti-fatigue technology, applied in the processing of Al-Cu-Mg alloy, improving the anti-fatigue performance of Al-Cu-Mg alloy, can solve the problem of cost, inconvenience of industrial production, low density of Gaussian texture, etc. problem, to achieve the effect of simple and reasonable process and high fatigue resistance

Active Publication Date: 2015-11-18
CENT SOUTH UNIV
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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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Embodiment 1

[0041]The alloy composition is: 3.8%Cu, 1.0%Mg, 0.3%Mn, and the balance is Al-Cu-Mg alloy homogenized. After the ingot is kept at 430°C 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 water quenched, followed by cold rolling with 80% deformation, and then subjected to 470°C salt bath solution treatment for 20 minutes and then 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 , 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, the balance is Al-Cu-Mg alloy homogenized, after the ingot is kept at 440°C for 1 hour, it is directly hot-rolled with 70% deformation. After that, cold rolling with 80% deformation is carried out, followed by annealing treatment at 400°C for 1 hour, and then natural aging treatment after water quenching for 20 minutes in a salt bath at 490°C. 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 , the expansion rate of the alloy was 0.00335mm / cycle.

Embodiment 3

[0045] The alloy composition is: 4.9% Cu, 1.5% Mg, 0.8% Mn, and the Al-Cu-Mg alloy with the balance of Al is homogenized. After the ingot is heated at 440°C for 1 hour, it is directly hot-rolled with 70% deformation. Then air solution treatment at 490°C for 1 hour and water quenching followed by cold rolling with 80% deformation, followed by natural aging treatment at 490°C salt bath for 20 minutes after water quenching. 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 , the expansion rate of the alloy was 0.0043mm / cycle.

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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 a processing method of an Al-Cu-Mg alloy, in particular to a method for improving the anti-fatigue performance of the Al-Cu-Mg alloy; it belongs to the technical field of nonferrous metal processing. technical background [0002] Al-Cu-Mg series alloys are precipitation-hardening aluminum alloys widely used in aerospace because of 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 a greater impact on aluminum alloys, so it is of great significance to further improve the fatigue properties of aluminum alloys. [0003] Studies have shown that in order to improve the fatigue resistance of this aluminum alloy, researches such as alloy impurity elements, atomic cluster size, pre-deformation, Cu-Mg composition ratio,...

Claims

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Application Information

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Patent Type & Authority Patents(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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