Phase transformation and thermal stability of aged Ti-Ni-Hf high temperature shape memory alloys

被引：0
作者：
Meng, Xianglong [1 ]
Cai, Wei
Lau, K. T.
Zhou, L. M.
Zhao, Liancheng
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2006年 / 22卷 / 05期
关键词：
TiNiHf alloy; high temperature shape memory alloy; aging; phase transformation;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The use of Ni-rich TiNiHf alloys as high temperature shape memory alloys (SMAs) through aging has been presented. For Ni-rich Ti80-xNixHf20 alloys, their phase transformation temperatures are averagely increased more than 100 K by aging at 823 K for 2 h. Especially for the alloys with Ni-content of 50.4 at. pct and 50.6 at. pet, their martensitic transformation start temperatures (M,) are more than 473 K after aging. TEM observation confirmed that some fine particles precipitate from the matrix during aging. The aged Ni-rich TiNiHf SMAs show the better thermal stability of phase transformation temperatures than the solution-treated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.
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页码：691 / 695
页数：5
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