Tailoring of microstructure and martensitic transformation of nanocrystalline Ti–Ni-Hf shape memory thin film
Tailoring of microstructure and martensitic transformation of nanocrystalline Ti–Ni-Hf shape memory thin film作者机构：School of Materials Science and Engineering Harbin Institute of Technology Center of Testing and Analysis College of Materials Science and Chemical Engineering Harbin Engineering University College of Nuclear Equipment and Nuclear Engineering Yantai University
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2021年第31卷第2期
页 面：288-295页
核心收录：
学科分类：07[理学] 08[工学] 070205[理学-凝聚态物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China (Grant Nos. 51871080 51931004 and 51571073)
主 题：High temperature shape memory alloy Ti–Ni-Hf thin Film Crystallization Microstructure Martensitic transformation
摘 要：The amorphous Ti-Ni-Hf thin films with the specific compositions were prepared from single Ti-Ni-Hf alloy target by adjusting processing parameters of direct current magnetron sputtering deposition. Prior to the crystallization,a glass transition occurred in the present Ti-Ni-Hf thin films. The annealed Ti-Ni-Hf thin films were characterized by the nano-crystalline. With the annealing temperature increasing, the grain size firstly increased and then decreased owing to the presence of(Ti,Hf)Ni precipitate. Two endothermic and exothermic peaks corresponding to B19’■B2 martensitic transformation in heating and cooling curves were observed for the Ti-Ni-Hf thin films with the lower annealing temperature and shorter annealing time, which was closely related to the inhomogeneous composition. However, the Ti-Ni-Hf thin films annealed at higher annealing temperature and longer annealing time showed the single stage B19’■B2 martensitic transformation. In addition, the martensitic transformation temperatures firstly increased and then decreased with the annealing temperatures rising.
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