Shape memory effect and superelasticity in a strain glass alloy
Shape memory effect and superelasticity in a strain glass alloy
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DOI：
10.1103/physrevlett.97.225703
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发表时间：
2006-12-01
影响因子：
8.6
通讯作者：
Otsuka, Kazuhiro
中科院分区：
文献类型：
--
作者：
Wang, Yu;Ren, Xiaobing;Otsuka, Kazuhiro
形状记忆效应和超弹性通常存在于具有自发马氏体相变的合金中。因此，很难想象在没有马氏体相变的系统中会出现这种有趣的效应。在这封信中，我们显示了形状记忆和超弹性效应的非马氏体Ti48.5Ni51.5合金，没有马氏体相变，但经历了“应变玻璃”转变。原位x射线衍射实验表明，应变玻璃的形状记忆和超弹性源于应力诱导应变玻璃到马氏体的相变及其逆相变。应变玻璃中新的形状记忆和超弹性扩展了形状记忆效应和超弹性的范围，并可能导致新的应用。
The shape memory effect and superelasticity are usually found in alloys exhibiting spontaneous martensitic transformation. Thus it is hard to imagine that such interesting effects can appear in a system without a martensitic transformation. In this Letter we show shape memory and the superelasticity effect in a nonmartensitic Ti48.5Ni51.5 alloy, which has no martensitic transformation but undergoes a "strain glass" transition. In situ x-ray diffraction experiment showed that the shape memory and superelasticity in strain glass stem from a stress-induced strain glass to martensite transformation and its reverse transformation. The new shape memory and superelasticity in strain glass extends the regime of the shape memory effect and superelasticity and may lead to novel applications.