High Temperature Tensile Deformation Behavior of New Titanium Alloy Sheet TA32

High temperature tensile tests at deformation temperatures of 650-850℃ and strain rates of 0.001-0.100 s^-1 were conducted on TA32 titanium alloy sheet. The influence of deformation temperature and strain rate on high temperature tensile deformation behavior of the alloy was investigated. The high temperature rheological constitutive model of TA32 titanium alloy was established on the basis of modified Hooke law and Grosman equation, and verified by tests. The results show that the flow stress of TA32 titanium alloy was significantly affected by the deformation temperature and strain rate. The flow stress decreased with the increase of deformation temperature and the decrease of strain rate. The tensile strength of the alloy reached 680 MPa at the deformation temperature of 650℃ and strain rates of 0.100 s^-1, which was about 80% of the tensile strength at room temperature; the alloy still had the relatively high strength. When the deformation temperature increased from 750℃ to 850℃, the elongation increased and the strength decreased obviously, indicating the alloy had relatively good plasticity. The true stress-true strain curves calculated by the established high temperature rheological constitutive equation were in agreement with the tested results, and the correlation coefficient and average relative error were 0.979 4 and 11.1%, respectively, indicating that the constitutive model could describe the high temperature tensile deformation behavior of TA32 titanium alloy.