Abstract
In this study, spherical indentation responses of room temperature superelastic (homogenized Ni50.8Ti49.2 and 400 °C 3 h aged Ni45.3Ti29.7Hf20Pd5) and nonsuperelastic (Ni49.9Ti50.1 and 600 °C 3 h aged Ni45.3Ti29.7Hf20Pd5) are revealed as functions of maximum loading level in nano and macro scales. Experimental results showed that for all alloys, the depth and work recovery ratio decrease and then saturate with hmax/R. In contrast, indentation hardness increases and then saturates with indentation depth. Both NiTi and NiTiHfPd alloys have higher hardness in austenite than in martensite. NiTiHfPd alloys have a higher indentation hardness than NiTi alloys which was attributed to the higher strength of NiTiHfPd alloys.
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