Improvement in wear resistance of TiNi alloy processed by equal channel angular extrusion and annealing treatment

In the present paper, the equal channel angular extrusion (ECAE) and subsequent annealing treatment are applied to the Ti-50.6at.%Ni alloy. The microstructure and pseudo-elasticity of TiNi alloy after ECAE and annealing treatment are investigated, and the wear behavior of the alloy under dry sliding condition is studied. The results indicate that ECAE technique contributes to refine the microstructure and improve the pseudo-elasticity of the TiNi alloy. The wear of TiNi alloys increases with load. Moreover, the ECAE processed TiNi alloy exhibits higher resistance to wear compared with the as-received TiNi alloy. For as-received TiNi alloy, adhesion and delamination were main damage mode under low load, while deep plough tracks were observed under high load. The slight adhesive wear was primary wear mode for the ECAE processed TiNi alloy under both low and high loads.