Asymmetry of Tension-Compression Performances and Strain Rate Sensitivity of TA2

The behavior of commercially pure titanium (TA2) under tension and compression was investigated at different strain rates. Significant tension-compression asymmetry in yielding and strain hardening were observed. The results show that with the increase of deformation strain rate, the asymmetry of TA2 increases. The microscopic deformation mechanisms and microstructure evolutions of commercially pure titanium under tension and compression were analyzed by electron backscattered diffraction (EBSD) techniques. The results show that the compressive deformation of commercially pure titanium is dominated by deformation twinning while the tensile deformation is dominated by the dislocations sliding. The macroscopic tension-compression asymmetry of commercially pure titanium is determined by load sensitivity of microscopic deformation behaviors and its strain rate sensitivity is due to the different influences of strain rate on properties of tension and compression.