Design and fabrication of a (beta plus alpha '') dual-phase Ti-Nb-Sn alloy with linear deformation behavior for biomedical applications

摘要

In this study, a (beta+alpha '') dual-phase Ti-33Nb-4Sn alloy was successfully fabricated by a designated severe cold rolling plus pre-deformation (CRP) treatment to display a linear deformation behavior. Upon CRP treatment, a high density of dislocation tangles and grain refinement were induced into the Ti-33Nb-4Sn alloy consisting mainly of alpha '' martensite as well as some retained beta parent phase. Due to the retardation effect of dislocations and grain boundaries on martensitic transformation, the slight stress induced martensitic (SIM) transformation from beta to alpha '' in CRP Ti-33Nb-4Sn alloy covered a wide stress range during loading, together with the linear elastic deformation behavior of beta and alpha '' phases. In such a case, the (beta+alpha '') dual-phase Ti-33Nb-4Sn alloy exhibited macroscopically linear deformation behavior before yielding. Our results might shed light on design and development of novel (beta+alpha '') dual-phase Ti-based alloy with linear deformation behavior for biomedical applications. (C) 2019 Elsevier B.V. All rights reserved.