High temperature deformation behavior of TC4 titanium alloy and its flows stress model

The effect of processing parameters on deformation behavior of TC4 titanium alloy were investigated by using compression tests. The experiments were carried out in a Thermermaster-Z simulator at deformation temperatures of 1093-1303 K, strain rates of 0.001-10.0 s^-1, and height direction reduction of 60%. The results show that the flow stress of TC4 titanium alloy increases quickly with the strain and reaches a peak, then decreases to a steady value. The steady and peak stress significantly decreases with the increase of deformation temperature and decrease of strain rate, and the strain rate and the deformation temperature would also affect the critical value of strain to reach the steady flow of TC4 titanium alloy during high temperature deformation. The flow stress model of TC4 titanium alloy during high temperature deformation was established by using the regression method. The average relative difference between the calculated and experimental flow stress is 6.25%. The flow stress model can efficiently predict the deformation behavior of TC4 titanium alloy during high temperature deformation.