DRY SLIDING WEAR OF Cu-BASED SHAPE MEMORY ALLOY

The wear of Cu-based CuZnAl shape memory alloys under dry sliding against steel wasfound to be plasticity-dominated,with adhesion and delamination being the two main mecha-nisms.Adhesion was found to be accompanied by metal transfer.TEM observation on tensiletest of thin foil showed that the stress-induced martensitic transformation occurred fromβ-phase in the vicinity of pre-existing microcracks.The blunt effect of crack tips may beproposed to explain the wear of CuZnAl shape memory alloy due to preferential orientationreaction of variants in martensite and stress-induced martensitic transformation in β-phase.