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Title:: Martensitic Transformation and Shape Memory Effect of Ti Ni Based High Temperature Shape Memory Alloys

Author(s):: CAI Wei; MENG Xianglong; ZHAO Xinqing; CUI Lishan; XU Huibin; （1 Harbin Institute of Technology, Harbin 150001, China）
（2 Beihang University，Beijing 100191，China）
（3 China University of Petroleum Beijing ，Beijing 266580，China）

Abstract:: The recent development of TiNibased high temperature shape memory alloys (SMAs) and their applications were reviewed in this paper.The TiNibased high temperature SMAs mainly include TiNiPd,TiNiZr and TiNiHf alloys.The phase transformation temperatures can be adjusted by aging treatment.The martensitic transformation behaviors,microstructure,shape memory effect and superelasticity properties of TiNibased high temperature SMA bulk materials,ribbons and thin films were summarized.The strengthening caused by the precipitation of nanoscale particle during aging in TiNiHf alloys should be responsible for the improvement of shape memory effect and superelasticity properties.It has been presented that finding the ways to increase the transformation temperatrues and improve shape memory effect is the main trend of research and development of TiNIbased high temperature SMAs.