标题：Multi-stage martensitic transformation in Ni-rich NiTi shape memory alloys
作者：Wang, Xiebin; Verlinden, Bert; Kustov, Sergey
作者机构：[Wang, Xiebin] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jingshi Rd 17923, Jinan 250061, Peoples R China.; [Verlind 更多
通讯作者地址：[Wang, XB]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jingshi Rd 17923, Jinan 250061, Peoples R China.
来源：FUNCTIONAL MATERIALS LETTERS
关键词：NiTi; shape memory alloys; multi-stage martensitic transformation; aging
摘要：Precipitation hardening is an effective way to improve the functional stability of NiTi shape memory alloys. The precipitates, mainly Ni4Ti3, could be introduced by aging treatment in Ni-rich NiTi alloys. However, the presence of Ni4Ti3 precipitates could disturb the transformation behavior, resulting in the multi-stage martensitic transformation (MMT). With the presence of MMT, it is difficult to control the transformation behavior, and thus limits the applicability of NiTi alloys. In this work, previous efforts on explaining the observed MMT are summarized. The difficulties in developing a unified explanation are discussed, and a possible way to avoid the MMT is proposed.