Effect of Sn addition on stress hysteresis and superelastic properties of a Ti-15Nb-3Mo alloy

The effects of Sn content on the stress hysteresis and superelastic properties of Ti-15Nb-3Mo-(0-1.5)Sn were investigated. The stress hysteresis decreased with increasing Sn content due to the suppression of athermal ω phase formation. The addition of Sn was also very effective at increasing the superelastic recovery strain. Due to the dual effect of Sn, which both decreases the Ms and suppresses the athermal ω phase, the stress for inducing martensitic transformation decreased with increasing Sn content up to 1 at.%, then increased on further addition.