Heat treatment method for improving fatigue resistance of Al-Cu-Mg alloy

Abstract

A heat treatment method for improving fatigue resistance of Al-Cu-Mg alloy comprises: performing high-temperature short-time (505-535 DEG C / 1-25 min) solution hardening treatment on cold-rolled sheets, then performing natural aging at room temperature for 96 h or more. The aluminium alloy capable of being treated by the heat treatment method comprise the components: Cu, Mg, Ti and Al. The technology is simple and reasonable; and through high-temperature short-time solution hardening treatment, the alloy obtains relatively high goss texture components. Because most of crystal faces {111} of crystal grains in the alloy with high goss texture is positioned or close to the direction of the maximum external shearing stress, the reciprocating sliding of dislocation is promoted and a persistent slip band is easy to generate in the alloy, and thus the plasticity induction closure effect of fatigue crack is enhanced and the damage accumulation is reduced, also the crack deflection is promoted, and thus the fatigue crack spreading rate of the alloy is reduced and the fatigue resistance of the alloy is improved.

Description

technical field [0001] The invention discloses a heat treatment method for improving the anti-fatigue performance of an aluminum alloy, in particular to a high-temperature solution quenching heat treatment method capable of improving the anti-fatigue performance of an Al-Cu-Mg alloy. It belongs to the field of heat treatment of metal materials. Background technique [0002] Al-Cu-Mg series aluminum alloys are widely used in aviation flight devices. With the development of aviation technology, especially with the development of damage tolerance design theory, Al-Cu-Mg alloys are required to have excellent fatigue resistance. performance. At the same time, aluminum alloys used in aviation have encountered strong challenges from composite materials. The development of aluminum alloys that are resistant to fatigue damage is of great significance for the application and development of this alloy in the aviation field in the future. [0003] According to the existing research, t...

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Problems solved by technology

Studies have shown that the alloy can eliminate the dislocation entanglement in the cold-rolled state through solid solution. The conventional solution temperature of Al-Cu-Mg alloy is generally 490-500°C and the time is 0.5-2h, which can effectively eliminate the dislocation entanglement in the cold-rolled state. Dislocation entanglement configuration, however, with this treatment, the alloy will undergo complete recrystallization, which will weaken or even eliminate the Gaussian texture and reduce the fatigue resistance of the alloy. Therefore, a suitable solution quenching process is developed to make the alloy obtain a stronger It is an important method to improve the fatigue damage resistance of Al-Cu-Mg alloy, and it is of great importance to the application and development of the alloy in aerospace. the positive meaning of

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