Low-alloy content Ti-Mo-based alloys with large superelasticity and narrow stress hysteresis for potential biomedical applications

Abstract

In most Ni-free Ti-Nb- and Ti-Zr-based superelastic alloys, large amounts of high-cost and rare elements such as Nb, Ta, Hf and/or Zr are contained, increasing the cost and fabrication difficulty of the alloy. Here, new low-alloy content Ti-Mo-Zr-Sn-Al alloys are developed with large room temperature superelasticity and narrow stress hysteresis for potential biomedical applications. A good combined performance of yield stress (477 MPa) and small stress hysteresis (117 MPa) is achieved at room temperature in Ti-8Mo-6Zr-6Sn-5Al (wt%) alloy showing a recovery strain of 4.4%, which has not been obtained in previously reported Ni-free Ti-Nb, Ti-Zr and Ti-Mo-based superelastic alloy.

Keywords

• Ti-Mo-Zr-Sn-Al alloy
• shape memory alloys
• superelasticity
• stress hysteresis
• athermal ω phase