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Recent studies demonstrate that near equiatomic Ti-Ni alloys possess high resistance to surface damage by wear. It is suggested that the high wear resistance of Ti-Ni alloys is closely correlated to their pseudoelasticity, which is usually evaluated by tensile testing. However, when a Ti-Ni alloy is under wear, its surface is in a complex stress state. Since the thermoelastic martensitic transformation of Ti-Ni alloys responds differently to different stresses, it may not be appropriate to evaluate the pseudoelasticity by tensile testing. The present paper reports recent work on pseudoelastic behaviour of a Ti-51 at.-%Ni alloy employing a microindentation technique as well as tensile testing methods. In the present work, the wear performances of Ti-51 at.-%Ni alloy specimens with different degrees of pseudoelasticity were also investigated, and efforts were made to explain the beneficial effect of pseudoelasticity on the wear resistance of Ti-Ni alloys.MST/4450

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