Microstructure and mechanical properties of a commercially pure Ti processed by warm equal channel angular pressing

The strengthening contributions of the grain size, equivalent oxygen content (Oeq) and Low Angle Grain Boundaries (LAGBs) to the yield stress were identified by the Hall Petch and Taylor equations. The strengthening coefficient k of the Hall-Petch relation was approximately 5 MPa mm−1/2, with an increment of 0.44 MPa mm−1/2 per 0.1 Oeq.-%, while the LAGB strengthening contribution was responsible approximately by half of the experimental yield stress values measured.