变形温度对TA1工业纯钛板拉压不对称性的影响

The asymmetry of yield and hardening of TA1 commercially pure titanium (CP-Ti) plate was studied through uniaxial tension and compression experiments under lower, room and high temperature. The results of metallographic experiments show that the CP-Ti plate exhibites a large number of twins and more twins generated under compression conditions when the true strain is 0.18 under lower temperature. EBSD measurement results show that the number of twins decreases significantly with the increase of deformation temperature. In uniaxial tension, it is beneficial to the initiation of {112^-2} compression twins. With the increase of deformation temperature, the tensile deformation mechanism is no longer dominated by twinning. In uniaxial compression, it is beneficial to the initiation of{101^-2} tension twins. There is still a small amount of tensile twins initiation in uniaxial compression under 500 ℃, and the strain hardening behavior is remarkable. The influence of deformation temperature on the tension-compression asymmetry is closely related to the temperature sensitivity of the twin behavior of CP-Ti plate.