Cooling-induced shape memory effect and inverse temperature dependence of superelastic stress in Co2Cr(Ga,Si) ferromagnetic Heusler alloys
Cooling-induced shape memory effect and inverse temperature dependence of superelastic stress in Co2Cr(Ga,Si) ferromagnetic Heusler alloys
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DOI：
10.1063/1.4825271
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发表时间：
2013-10-14
影响因子：
4
通讯作者：
Kainuma, Ryosuke
中科院分区：
文献类型：
--
作者：
Xu, Xiao;Omori, Toshihiro;Kainuma, Ryosuke
通常，形状记忆效应（SME）是通过逆马氏体相变获得的，因此只能通过从变形的马氏体相加热样品来诱导。在这项研究中，我们报告的现象，冷却引起的SME，观察到在Co2Cr（Ga，Si）Heusler合金，其中正常的加热引起的SME可以在同一时间获得。Co2Cr（Ga，Si）Heusler合金的冷却诱发SME归因于异常马氏体相变。此外，还观察到超弹性应力的逆温度依赖性。这些现象的发现为形状记忆合金的应用提供了可能性，特别是在低温下。(C)2013 AIP Publishing LLC.
Normally, shape memory effect (SME) is obtained by the reverse martensitic transformation, therefore only induced by heating a sample from the deformed martensite phase. In this study, we report a phenomenon of cooling-induced SME, observed in a Co2Cr(Ga,Si) Heusler alloy, where the normal heating-induced SME can be obtained at the same time. The cooling-induced SME is attributed to an abnormal martensitic transformation in Co2Cr(Ga,Si) Heusler alloy. Moreover, an inverse temperature dependence of superelastic stress was also observed. The discoveries of these phenomena provide application possibilities for shape memory alloys, especially at low temperatures. (C) 2013 AIP Publishing LLC.