Hot Deformation Behavior of 7085 Aluminum Alloy Based on Constitutive Model, Processing Map, and Microstructure Evolution

To understand the hot deformation behavior of 7085 aluminum alloy, compression tests were performed under varied conditions (593-743 K/0.001-1 s^-1). While the true stress-strain curves predominantly display the features of dynamic recovery, the softening mechanism shifts towards dynamic recrystallization when deforming at higher temperatures and lower strain rates. The validity of the constructed strain-compensated Zener-Hollomon model is confirmed by its exceptional precision in forecasting the flow stress, achieving an R² value of 0.992. The instability areas are concentrated in the high-strain-rate regions, and the optimal deformation processing for 7085 aluminum alloy is 693-743 K/0.01-0.001 s^-1. The alloy's softening mechanism undergoes a transition from solely dynamic recovery to a progressively more significant coordinated role of dynamic recovery and dynamic recrystallization as the temperature rises and the strain rate drops.