High temperature deformation behavior and processing map of Zn-8Cu-0.3Ti Zn alloy

The hot compression deformation of Zn-8Cu-0.3Ti alloy was performed on Gleeble-1500D at temperature of 230-380 ℃,strain rate of 0.01-10 s-1,height direction reduction of 50%.The true stress-strain curves under different deformation conditions were obtained and the processing map was developed based on the dynamic material modeling(DMM).The results indicate that the flow stress is sensitive to the strain rate and the deforming temperature.The flow stress increases with increasing the strain rate,and decreases with increasing the deforming temperature,which can be described by a constitutive equation in the form of Arrhenius function.The processing map shows one unsteady zone of high temperature deformation of Zn-8Cu-0.3Ti alloy,which is above strain rate of 0.2 s-1.At the temperature of 340-370 ℃ and below the strain rate of 0.001 s-1,the peak efficiency of power dissipation is 0.53,in which zone the deformation mechanism is dynamics recrystallization(DR).