Controlling reversible martensitic transformation in titanium alloys with high strength and low elastic modulus

摘要

This paper reports on β-type titanium alloys with high β transus temperature and low martensite start temperature that display high strength and low elastic modulus. The strategy is based on Zr and Sn additions to Ti-Nb-based alloys. The α" martensite in Ti-24Nb-4Zr-8Sn alloy is structurally much closer to the β phase than other alloys in terms of transformation strain and tetragonality, allowing homogeneously nucleated reversible mechanisms to be triggered before the formation of nanoscaled equiaxed a" martensite by strain glass transition.