1. Improvement of as-cast microstructure of aluminum alloy processing materials by hot deformation processing. The aluminum alloy has high plasticity and low resistance at high temperature, and the atomic diffusion process is intensified, accompanied by complete crystallization, which is beneficial to the improvement of the structure. Under the condition of three-compression compressive stress state, thermal deformation is the most effective way to change the as-cast microstructure of aluminum and aluminum alloy. By giving the amount of deformation as described, it is possible to cause the following changes in the as-cast structure.
2. Control of crystal grain size of heat-deformed products. The grain size of the product after thermal deformation depends on the degree of deformation and the deformation temperature. When processing aluminum and aluminum alloy materials in the completely softened temperature range, the deformation amount should be greater than 10% in order to obtain uniform fine particles, such as the critical deformation degree of 2024 aluminum alloy, and 2% when the degree of deformation is large. 8%, should be greater than 10% at the deformation speed.
3, the thermal deformation of the fiber structure, in the process of thermal deformation, the internal grain, impurities, and the second phase and various defects are elongated and thinned along the direction of the maximum extension of the main deformation, and the strength of the fiber direction is formed. The strength of the aluminum alloy material in other directions is generally given, and the aluminum alloy material exhibits different degrees of anisotropy.
4, the recovery and love crystallization during the hot deformation process. During the thermal deformation process, aluminum and aluminum alloy materials generally undergo dynamic recovery and crystallization under stress conditions.
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