来源：http://www.jndclyyxgs.com 发布时间：2021-06-08 14:52:11
1、 Brief introduction of low temperature thermomechanical treatment of aluminum alloy plate
Low temperature thermomechanical treatment is also called deformation aging. A wide range of treatment methods are as follows:
① Quenching cold (warm) deformation artificial aging;
② Quenching natural aging cold deformation artificial aging;
③ Quenching artificial aging cold deformation artificial aging.
Cold deformation results in dislocation network, which makes the nucleation of desolvent phase more extensive and uniform, which is beneficial to improve the cohesion and plasticity, and sometimes the corrosion resistance of aluminum alloy plate.
2、 Effect of cold deformation on failure process of aluminum alloy plate
1. The effect of cold deformation on the aging process of aluminum alloy sheet is complex. It is related to the rules of quenching, deformation and aging, and also to the nature of aluminum alloy plate. For the same alloy, it is related to the type of precipitation phase during aging. In short, for the alloy strengthened mainly by forming dispersed transition phase, cold deformation before aging will improve the strength of the alloy. After quenching, the desolvation and recovery occur simultaneously when the alloy is heated to aging temperature after cold deformation.
The desolvation will be accelerated by cold deformation, and the desolvation phase particles will be more dispersed by cold deformation. At the same time, the desolvent point also hinders the recovery process such as multilateralization. If the multilateralization process has taken place, the distribution and density of particles in the desolvent phase will also change with the change of dislocation distribution and density.
2. Warm deformation can also be used in low temperature thermomechanical treatment. The dynamic recovery is very intense during warm deformation, which is beneficial to improve the thermal stability of the material after thermomechanical treatment. Low temperature thermomechanical treatment is especially useful for Al Cu Mg alloys.
For example, 2A12 aluminum alloy plate is deformed by 20% after quenching, and then aged at 130 ℃ for 10 ~ 20h. Compared with conventional heat treatment, the tensile strength and yield strength of 2A12 aluminum alloy plate can be increased by 60N / mm2 and 100N / mm2 respectively, and the plasticity is still good. 2A11 aluminum alloy plate is rolled at 150 ℃ after quenching, and then aged at 100 ℃ for 3h. Compared with the material aged directly according to the same specification after quenching, the tensile strength and yield strength of 2A12 aluminum alloy plate are increased by 50N / mm2 and 130n / mm2 respectively, But a value decreased by 50%.