Analysis of twinning behavior of pure Ti compressed at different strain rates by Schmid factor

Electron backscattering diffraction technique and calculated Schmid factor presented in a spherical coordinate system were applied to investigate the twinning behavior of Gr2 purity Ti under both quasi-static and dynamic compressive deformation. Three twinning systems { 10 1 ¯ 2 } , { 11 2 ¯ 2 } and { 11 2 ¯ 1 } were identified. With the help of the calculated SF map, the corresponding critical resolved shear stress range was determined to be 321–361 MPa, 367–393 MPa and 525–538 MPa. Moreover, strain rate was proved to have a minor effect on the value of CRSS of twinning.