Microstructure and martensitic transformation of Ti49Ni51 − xHfx high temperature shape memory alloys |
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| Authors: | Yunxiang Tong Feng Chen Li Li |
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| Affiliation: | a Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China
b Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing, China |
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| Abstract: | In present work, the microstructure and martensitic transformation of Ti49Ni51 − xHfx (x = 3-15) alloys were studied. The microstructure of Ti49Ni51 − xHfx alloys consists of B19′ martensite and (Ti,Hf)2Ni phase at room temperature. The martensitic transformation behavior is characterized by a single-stage transformation. With increasing Hf content, the transformation temperature increases from 75 to 279 °C resulting from the reduced valence electron concentration, indicating that the replacement of Hf for Ni is effective in increasing the transformation temperatures. The results suggest that the Ti49Ni51 − xHfx shape memory alloy is one of potential candidates for high temperature applications. |
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| Keywords: | High temperature shape memory materials Martensitic transformation Microstructure TiNiHf |
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