Abstract
NiTi-based alloys with high nickel content have been utilized as a novel bearing material because of their exceptional hardness, superior wear resistance and corrosion resistance etc. In this work, microstructure, hardness and wear behavior of (Ni56Ti44)95Fe5 alloy were investigated as a function of aging duration. It is found that with increasing aging duration, Ni4Ti3 phase formed continuously and transformed into Ni3Ti phase in a short time due to the addition of Fe. In this case, the highest hardness (729 HV) and the lowest coefficient of friction (0.611) were obtained in the sample aged at 400 °C for 5 h. The dependence of hardness and wear behavior of (Ni56Ti44)95Fe5 alloy was attributed to the combined effect of Orowan strengthening by nano-sized Ni4Ti3 phase and the soften effect of Ni3Ti phase. The wear behavior of (Ni56Ti44)95Fe5 alloy was governed by the combined mechanism of adhesive wear, abrasive wear and oxidative wear.
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