Development of processing maps for DC cast 7065 aluminum alloy

Abstract

The deformation behavior and microstructure evolution of DC cast 7065 aluminum alloy was studied in the temperature range of 340-460 °C and strain rate range of 0.1-8 s-1. Processing maps were developed to evaluate the efficiency of the hot deformation and to identify the instability region. The results show that the optimum range of processing conditions are in the strain rate range of 0.01-0.1 s-1 and temperature range of 380-410 °C, where the efficiencies are much higher when compared to other regions. The peak efficiencies for the 7065 alloys is evaluated in the region of T=380-460 °C and ε=0.01-0.1 s-1. Recrystallized grain was observed under these deformation conditions. The dynamic softening is more pronounced at higher deformation strain rate and deformation temperature.