Martensitic transformation and shape memory properties of Ti-Ta-Sn high temperature shape memory alloys
Martensitic transformation and shape memory properties of Ti-Ta-Sn high temperature shape memory alloys
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DOI：
10.1016/j.msea.2011.06.021
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发表时间：
2011-09-15
期刊：
影响因子：
6.4
通讯作者：
Miyazaki, Shuichi
中科院分区：
文献类型：
--
作者：
Kim, Hee Young;Fukushima, Tatsuhito;Miyazaki, Shuichi
研究了Ta和Sn含量对Ti-Ta-Sn合金马氏体相变温度、晶体结构和热稳定性的影响，以开发新型高温形状记忆合金。时效或热循环可显著降低Ti-Ta二元合金的马氏体相变温度，这是由于在Ti-Ta二元合金中形成了Ω相。Sn的添加对于抑制Ω相的形成是有效的，并且提高了热循环期间形状记忆效应的稳定性。抑制老化效应所需的Sn含量的量随着Ta含量的降低而增加。通过调整Ta和Sn的含量，可以获得高的马氏体相变温度和良好的热稳定性。此外，在保持相变温度不变的情况下，添加Sn替代Ta，可提高Ti-Ta-Sn合金的相变应变。Ti-20 Ta-3.55n合金表现出稳定的形状记忆效应，其马氏体相变开始温度约为440 K，与具有相近马氏体相变温度的Ti-Ta二元合金相比，具有较大的回复应变。(C)2011 Elsevier B. V.保留所有权利。
The effects of Ta and Sn contents on the martensitic transformation temperature, crystal structure and thermal stability of Ti-Ta-Sn alloys are investigated in order to develop novel high temperature shape memory alloys. The martensitic transformation temperature significantly decreases by aging or thermal cycling due to the formation of omega phase in the Ti-Ta binary alloys. The addition of Sn is effective for suppressing the formation of omega phase and improves stability of shape memory effect during thermal cycling. The amount of Sn content necessary for suppressing aging effect increases with decreasing Ta content. High martensitic transformation temperature with good thermal stability can be achieved by adjustment of the Ta and Sn contents. Furthermore, the addition of Sn as a substitute of Ta with keeping the transformation temperature same increases the transformation strain in the Ti-Ta-Sn alloys. A Ti-20Ta-3.55n alloy reveals stable shape memory effect with a martensitic transformation start temperature about 440 K and a larger recovery strain when compared with a Ti-Ta binary alloy showing similar martensitic transformation temperature. (C) 2011 Elsevier B.V. All rights reserved.