Effect of Ta addition on shape memory behavior of Ti-22Nb alloy
Effect of Ta addition on shape memory behavior of Ti-22Nb alloy
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DOI：
10.1016/j.msea.2005.10.065
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发表时间：
2006-02-15
期刊：
影响因子：
6.4
通讯作者：
Miyazaki, S
中科院分区：
文献类型：
--
作者：
Kim, HY;Hashimoto, S;Miyazaki, S
Ta对Ti-22 at.%合金显微组织和形状记忆行为的影响为了提高铌合金的形状记忆和超弹性性能，对铌合金进行了研究。研究了Ti-22 at.% Nb-（0-8at.%）对钽合金进行了不同温度下的拉伸试验和不同恒定应力下的热循环试验。Ti-22 Nb合金在室温下具有形状记忆效应，最大回复应变为2.7%。Ti-22 Nb合金的马氏体相变温度每降低1at.%降低30 K添加Ta。超弹性应变随Ta含量的增加而增加。Ti-22 Nb-（6-8）Ta合金在2%的拉伸应变下表现出近乎完美的超弹性行为。表观屈服应力随Ta含量的增加而降低，在4at.%附近达到最小屈服应力，然后通过进一步添加Ta来增加屈服应力。滑移临界应力随Ta含量的增加而增加。较高的滑动临界应力和较低的诱发马氏体相变的应力导致Ti-22 Nb-（4-6）Ta合金的形状恢复应变大于3.0%。(c)2005 Elsevier B. V.保留所有权利。
Effect of Ta addition on microstructure and shape memory behavior of a Ti-22 at.%Nb alloy was investigated in order to improve the shape memory and superelastic properties. The mechanical properties and shape memory behavior of Ti-22at.%Nb-(0-8at.%)Ta alloys were investigated by tensile tests at various temperatures and thermal cycling tests under various constant stresses. The shape memory effect with the maximum recovery strain of 2.7% was observed at room temperature in the Ti-22Nb alloy. The martensitic transformation temperature of the Ti-22Nb alloy decreased by 30K per 1at.% addition of Ta. The superelastic strain increased with increasing Ta content. Almost perfect superelastic behavior was observed until 2% tensile strain in the Ti-22Nb-(6-8)Ta alloys. The apparent yield stress decreased with increasing Ta content reaching a minimum yield stress around 4at.%, and then the yield stress increased by further addition of Ta. The critical stress for slip increased with increasing Ta content. A higher critical stress for slip and a lower stress for inducing martensitic transformation resulted in a larger shape recovery strain above 3.0% in the Ti-22Nb-(4-6)Ta alloys. (c) 2005 Elsevier B.V. All rights reserved.