TITLE:
Wear Resistance and Indentation Behavior of Equiatomic Superelastic TiNi and 60NiTi
AUTHORS:
Rabin Neupane, Zoheir Farhat
KEYWORDS:
TiNi, 60NiTi, Superelasticity, Dent Resistance, Wear Resistance
JOURNAL NAME:
Materials Sciences and Applications,
Vol.6 No.7,
July
31,
2015
ABSTRACT: Indentation and reciprocating wear tests are carried out to study dent and wear resistance of superelastic Ti-Ni alloys. The effect of loading rate on the superelastic behavior of TiNi under indentation loading is investigated and compared to a new generation of shape memory alloys, i.e., 60NiTi. Only limited amount of work has been done to investigate the dependency of superelasticity on loading rate of TiNi under localized compressive loads, but much work is directed towards understanding the effect of strain rate on tensile properties. Understanding the superelastic behavior helps to employ superelastic alloys in applications where high impact loading is expected as in bearings and gears. In the present study, it is found that dent resistance of Ti-Ni alloy is not significantly affected by loading rate (within the employed loading conditions). It has also been found that new-generation 60NiTi alloy exhibits superior wear and dent resistance, as well as higher hardness compared to equiatomic TiNi.