Superelasticity at Low Temperatures in Cu-17Al-15Mn (at%) Shape Memory Alloy
Superelasticity at Low Temperatures in Cu-17Al-15Mn (at%) Shape Memory Alloy
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DOI：
10.2320/matertrans.m2011128
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发表时间：
2011-08
影响因子：
1.2
通讯作者：
K. Niitsu;T. Omori;R. Kainuma
中科院分区：
文献类型：
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作者：
K. Niitsu;T. Omori;R. Kainuma
研究了 Cu-17Al-15Mn 合金在 77 K 至 273 K 温度下的超弹性。该合金没有出现热诱发马氏体相变，在77 K时表现出了良好的超弹性，恢复应变为8.5%。应力诱发马氏体相变的临界应力随着温度的降低而减小，并且在低温下由于熵变的减小，其梯度变得更小。 77 K 时的熵变估计为 -0.46 J/(mol·K)，几乎是 221 K 时的三分之一。
Superelasticity at temperatures between 77 K and 273 K in Cu-17Al-15Mn alloy was investigated. In this alloy, where no thermally-induced martensitic transformation appears, an excellent superelasticity with recovery strain of 8.5% was confirmed at 77 K. The critical stresses for stress-induced martensitic transformation decrease with decreasing temperature and its gradient becomes smaller at low temperatures due to the decrease of entropy change. The entropy change estimated at 77 K is −0.46 J/(mol·K), which is almost one-third of that at 221 K.