Microstructure, martensitic transformation and superelasticity of Ti49.6Ni45.1Cu5Cr0.3 shape memory alloy
Microstructure, martensitic transformation and superelasticity of Ti49.6Ni45.1Cu5Cr0.3 shape memory alloy
复制标题
DOI：
10.1016/j.matlet.2010.09.036
复制
发表时间：
2011-01
影响因子：
3
通讯作者：
Qingyu Wang;Yufeng Zheng;Yinong Liu
中科院分区：
文献类型：
--
作者：
Qingyu Wang;Yufeng Zheng;Yinong Liu
研究了以Cu和Cr替代Ni的Ti49.6Ni45.1Cu5Cr0.3合金的显微组织、马氏体相变行为、形状记忆效应和超弹性性能。在623 ~ 1273 K的整个退火温度范围内，合金经退火处理后，即使有Ti 2（Ni，Cu）析出相存在，也表现出单步A-M/M-A转变。随着退火温度的升高，相变温度经历了从623 K升高到873 K、从873 K降低到1023 K和从1023 K不变到1273 K的三个阶段。同时，应力诱发马氏体相变的临界应力先减小到最小值，然后再增大，呈V型曲线。在623、773和923 K退火后，当变形量小于20%时，合金的形状回复率均大于90%。
The aim of this study is to investigate the microstructure, martensitic transformation behavior, shape memory effect and superelastic property of Ti49.6Ni45.1Cu5Cr0.3alloy, with Cu and Cr substituting for Ni. After annealing, the alloy showed single step A–M/M–A transformations within the whole annealing temperature range of 623K to 1273K even in the presence and Ti2(Ni, Cu) precipitates. With the increase of the annealing temperature, the transformation temperatures exhibited three stages: increasing from 623K to 873K, decreasing from 873K to 1023K and unchanging from 1023K to 1273K. Meanwhile, the critical stress for stress induced martensitic (SIM) transformation decreased to a minimum value and increased after that, exhibiting a V shape curve. The alloy annealed at 623, 773 and 923K exhibited shape recovery ratio more than 90% when the deformation strain was below 20%.