Martensitic transformation and shape memory effect of Ni49.6Ti45.4Ta5 shape memory alloy

被引：1
|
作者：
Mei, H. [1 ]
Liu, J. C. [1 ]
Chen, F. [1 ]
Tong, Y. X. [1 ]
Zarinejad, M. [2 ]
机构：
[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Peoples R China
[2] PB Res Ctr, Dept Mat Sci & Technol, Oshawa, ON L1H 7K4, Canada
来源：
MATERIALS LETTERS | 2023年 / 337卷
基金：
中国国家自然科学基金;
关键词：
NiTiTa; Phase transformation; Microstructure; Shape memory; Martensite; TA; MICROSTRUCTURE; TEMPERATURES; BEHAVIOR;
D O I：
10.1016/j.matlet.2023.133937
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
NiTiTa shape memory alloys (SMAs) exhibit higher corrosion resistance and much better X-ray visibility in comparison with NiTi SMAs. In this work, the martensitic transformation, microstructure, and shape memory effect (SME) of Ni49.6Ti45.4Ta5 SMA are studied. When solution-treated, the alloy undergoes a single-step B2 <-> B19 ' transformation upon cooling and heating, which is gradually shifted to lower temperatures because of thermal cycling. A martensitic microstructure with well-defined twin variants is observed which is beneficial for SME whereas the formation of (Ta, Ti)2Ni phases may deteriorate it. After an optimal thermomechanical treatment, the maximum recovery strain reaches up to 5.32% under a pre-strain of 7%.
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页数：5
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