Enhanced Strength and Ductility of Ultrafine‐Grained Ti Processed by Severe Plastic Deformation

Abstract

Abstract This work deals with the study of strength and ductility in ultrafine‐grained (UFG) Ti Grade 4 produced by equal channel angular pressing (ECAP) in combination with subsequent thermomechanical treatments. We found that additional annealing of UFG Ti resulted in unusual enhancement of strength and ductility, which is associated with not only small grain size but also with a grain boundary structure. The origin of this phenomenon is investigated using the results of transmission electron microscopy and atom probe tomography. The innovation potential of UFG Ti for medical use is considered.