Martensitic transformation and shape memory effect of Ni49.6Ti45.4Ta5 shape memory alloy
Martensitic transformation and shape memory effect of Ni49.6Ti45.4Ta5 shape memory alloy
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DOI：
10.1016/j.matlet.2023.133937
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发表时间：
2023-04
影响因子：
3
通讯作者：
H. Mei;J.C. Liu;F. Chen;Y. Tong;Mehrdad Zarinejad
中科院分区：
文献类型：
--
作者：
H. Mei;J.C. Liu;F. Chen;Y. Tong;Mehrdad Zarinejad
与NiTi形状记忆合金相比，NiTiTa形状记忆合金（SMA）具有更高的耐腐蚀性和更好的X射线可见性。研究了Ni49.6Ti45.4Ta5形状记忆合金的马氏体相变、显微组织和形状记忆效应。固溶处理时，合金在冷却和加热时经历一步B2 B19 '转变，由于热循环，该转变逐渐转移到较低的温度。结果表明，在最佳形变热处理条件下，当预应变为7%时，最大回复应变可达5.32%。
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 Ni49.6Ti45.4Ta5SMA 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%.