Phase transformation and microstructure of quaternary TiNiHfCu high temperature shape memory alloys

被引：34
作者：
Meng, XL [1 ]
Cai, W
Lau, KT
Zhao, LC
Zhou, LM
机构：
[1] Harbin Inst Technol, Dept Math Phys & Chem, 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：
INTERMETALLICS | 2005年 / 13卷 / 02期
关键词：
martensitic transformations; thermal stability; shape-memory effects (including superelasticity); martensitic structure; microstructure;
D O I：
10.1016/j.intermet.2004.07.044
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of Cu addition on the phase transformation and microstructure of TiNiHf high temperature shape memory alloy has been studied. The experimental results show that the TiNiHfCu alloy undergoes a B2<---->B19' transformation with a concentration of 3 at.% Cu. And a two-step phase transformation occurs upon heating when the Cu content is 5 at.%. The constitutional phases of TiNiHfCu quaternary alloys are the matrix and (Ti,Hf,Cu)(2)Ni particles. The substructure of martensite is mainly (001) compound twin in TiNiHfCu alloys. The martensite variants are (011) type I twin related. The phase transformation temperatures decrease rapidly during the initial several thermal cycles and then keep constant with further increasing of the thermal cycles. It should be noticed that the R-phase transition is separated from the martensitic transformation during the cooling process in the TiNiHfCu alloys. The underlying reasons have been discussed. (C) 2004 Elsevier Ltd. All rights reserved.
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收藏
页码：197 / 201
页数：5
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