Advanced mechanical properties of pure titanium with ultrafine grained structure

The mechanical properties of commercially pure (CP) Ti at room temperature were investigated. The decreasing grain size in CP Ti leads to significant increases in its hardness and/or strength. A combination of severe plastic deformation by high pressure torsion at 5 GPa followed by short annealing at low temperatures allows one to obtain a high strength (more than 1200 MPa) in pure material that is comparable in strength to alloyed Ti. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.