Stabilization and two-way shape memory effect in Cu-Al-Ni single crystals
Stabilization and two-way shape memory effect in Cu-Al-Ni single crystals
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DOI：
10.1007/s11661-999-0041-9
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发表时间：
1999-03-01
影响因子：
2.8
通讯作者：
Ahlers, M
中科院分区：
文献类型：
--
作者：
Cingolani, E;Van Humbeeck, J;Ahlers, M
在 Cu-13.4 Al-4.0 Ni（mass pet）单晶中研究了时效过程中马氏体相稳定引起的双向形状记忆效应（TWME）。通过使用不同的热处理来确定长程有序度对转变的影响。转变温度受到奥氏体有序程度的强烈影响：从高于或低于第二相邻 L2(1) 有序温度进行退火会使 M-s 改变超过 100 摄氏度。已经确定，由于 Ni 的存在，该合金中奥氏体以及马氏体相的扩散速度比其他铜基合金慢得多。获得的 TWME 与进行其他更复杂的热机械训练时具有相似的效率。与 Cu-Zn-Al 单晶相比，该合金中的 TWME 稳定化并不完全。
The two-way shape memory effect (TWME) induced by stabilization of the martensite phase during aging has been studied in Cu-13.4 Al-4.0 Ni (mass pet) single crystals. The influence of the degree of long-range order on the transformation has been determined by using different heat treatments. The transformation temperatures are strongly influenced by the degree of order in the austenite: annealing from above or below the second neighbor L2(1) ordering temperature changes the M-s by more than 100 degrees C. It has been established that the diffusion in the austenite as well as in the martensite phase is considerably slower in this alloy than in other Cu-based ones, due to the presence of Ni. The obtained TWME has a similar efficiency as when other more complex thermomechanical trainings are made. In this alloy, the TWME by stabilization is not complete, in contrast to that in Cu-Zn-Al single crystals.