Hot Deformation Behavior of 7085 Aluminum Alloy Based on Deformation Heating and Friction

Abstract

The hot deformation behavior and constitutive analysis of AA7085 aluminum alloy based on the uncorrected and corrected flow stress for deformation heating and friction were investigated by hot compressive tests. The results show that deformation heating has more significant influence on the flow stress than that of friction. Two constitutive equations with and without deformation heating and friction could properly describe the hot deformation behavior of the material. However, the revised constitutive model to describe the hot deformation of AA7085 aluminum alloy taking account of deformation heating and friction is proposed at high strain rate, which gives the values of correlation coefficient and average absolute relative error are 0.989 and 4.86%, respectively.

Effect of Deformation Heating on the Flow Behavior and Processing Maps of Al–Zn–Mg–Cu Alloy

“…4(b)). This suggests that the samples without deformation heating have better the hot workability than that of the samples with deformation heating, which is agree with the report in AA7085 aluminum alloy by Yang et al 20) This is because at high strain rate, the heat generated by deformation heating can not release in time and promotes the occurrence of the flow instability and flow localization, which is not beneficial for the workability. With decreasing strain rate, the stable flow curves show that the samples undergo uniform and isothermal deformation.…”