Effect of Strain Rate on Tensile Properties of Commercial Pure Titanium Processed by ECAP at Room Temperature with a 90° Die

The uniaxial tensile test was applied to investigate the effect of strain rate (0.001 7, 0.01, 0.1 s-1) on the tensile properties and fractography of commercial pure titanium (CP-Ti) fabricated by equal channel angular pressing (ECAP)with one pass deformation at room temperature using a die of 90°. The results show as the strain rate rose from 0.001 7 s-1 to 0.1 s-1, elongation to fracture decreased from 17.9% to 14.9%, and ultimate tensile strength increased from 780 MPa to 926 MPa, and work hardening exponent reduced from 0.07 to 0.04. The fracture surface of CP-Ti exhibited tough fracture of dimple, and dimple became shallow with the increase of strain rate.