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) over bar2 (11 (2) over bar2) and 11121} 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. (C) 2013 Elsevier B.V. All rights reserved.