Flow Behavior and Activation Energy Evolution of 7075-T6 Al Alloy During Hot Deformation

In this paper, the hot deformation behavior of 7075-T6 aluminum alloy was studied by hot compression experiments. The results show that the flow stress exhibits a continuous decrease at low temperatures. At high temperatures, the flow stress exhibits a steady state. The softening at low temperatures is dominated by dynamic recovery (DRV), accompanied by coarsening of precipitates, resulting in a continuous decrease in flow stress. As the temperature increases, dynamic recrystallization (DRX) gradually strengthens, and the DRX mechanism gradually transforms from continuous dynamic recrystallization to geometric dynamic recrystallization. Compared to the strain-compensated Arrhenius-type model, the novel modified constitutive equation has a higher prediction accuracy, with a correlation coefficient as high as 0.9991 and an average relative absolute error as low as 2.0734