Spherical indentation of NiTi-based shape memory alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:651

Article

Li, Peizhen¹  Karaca, Haluk E.¹  Cheng, Yang-Tse² 

[1] Univ Kentucky, Dept Mech Engn, Lexington, KY 40506 USA

[2] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA

关键词: Spherical indentation;    Shape memory alloys;    Hardness;    NiTi;    NiTiHfPd alloys;    Phase transformation;   

DOI  :  10.1016/j.jallcom.2015.07.280

来源: Elsevier

【 摘 要 】

In this study, spherical indentation responses of room temperature superelastic (homogenized Ni50.8Ti49.2 and 400 degrees C 3 h aged Ni45.3Ti29.7Hf20Pd5) and nonsuperelastic (Ni49.9Ti50.1 and 600 degrees 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 h(max)/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. (C) 2015 Elsevier B.V. All rights reserved.

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