关键词: 再生5052铝合金, 热变形行为, 本构方程, 热加工图, 退火, 显微组织, 性能

Abstract: The rheological mechanical behavior of the annealed 5052 aluminum alloy under different deformation conditions, during the isothermal compression test with the strain rate ranging from 0.001 s^-1 to 10 s^-1 between 200 ℃ to 500 ℃ was investigated by means of thermecmastor 100 kN thermal simulation test machine. A constitutive equation was established based on the hyperbolic sine model, and hot working maps under different conditions were plotted to determine the optimal thermal deformation parameters. The tensile properties and microstructure of the alloy before and after annealing were systematically analyzed by using characterization methods such as universal testing machine, OM, SEM, and EBSD. The results indicate that the optimal hot working parameters for the annealed recycled 5052 aluminum alloy are as follows: at a strain of 0.3, deformation temperature of 380-500 ℃ and strain rate of 0.001-0.05 s^-1; at a strain of 0.5, deformation temperature of 360-500 ℃ and strain rate of 0.001-0.05 s^-1; and at a strain of 0.7, deformation temperature of 360-500 ℃ and strain rate of 0.002-0.05 s^-1. The recycled 5052 aluminum alloy sheet after annealing is not suitable for hot working below 300 ℃. After annealing at 500 ℃, the tensile strength, yield strength, and elongation of the alloy sheet reach 190 MPa, 86 MPa, and 40.8%, respectively, all of which exceed the requirements specified in GB/T 3880.2—2024 for the annealed 5052 alloy. The hot-rolled alloy sheet primarily exhibits Copper and Cube textures. After annealing, recrystallization occurs, resulting in equiaxed grains elongated along the rolling direction, with the texture dominated by the recrystallized Cube texture.

Key words: recycled 5052 aluminum alloy, thermal deformation behavior, constitutive equation, hot working maps, annealing, microstructure, properties