Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width
Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width
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DOI：
10.1038/nmat1593
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发表时间：
2006-04-01
期刊：
影响因子：
41.2
通讯作者：
Takeuchi, I
中科院分区：
文献类型：
--
作者：
Cui, J;Chu, YS;Takeuchi, I
从形状记忆合金（sma）的疲劳寿命到多铁氧化物的磁性，结构相变的可逆性在广泛的应用中具有深远的技术意义。马氏体的几何非线性理论普遍适用于所有的结构转变。它预测了相变的可逆性，表现在仅基于晶体对称性和相之间的几何相容性的滞后行为中。在这篇文章中，我们报道了这一事实。使用高通量方法的阳离子理论。为了快速绘制三元合金体系的晶格参数和热滞特性，设计了薄膜成分扩散技术。首次观察到滞回量与理论预测的变换拉伸张量的中间特征值之间存在明显的关系。我们还确定了一个新的富钛SMA组成区域，具有改善SMA性能控制的潜力。
Reversibility of structural phase transformations has profound technological implications in a wide range of applications from fatigue life in shape-memory alloys (SMAs) to magnetism in multiferroic oxides. The geometric nonlinear theory of martensite universally applicable to all structural transitions has been developed. It predicts the reversibility of the transitions as manifested in the hysteresis behaviour based solely on crystal symmetry and geometric compatibilities between phases. In this article, we report on the veri. cation of the theory using the high-throughput approach. The thin-film composition-spread technique was devised to rapidly map the lattice parameters and the thermal hysteresis of ternary alloy systems. A clear relationship between the hysteresis and the middle eigenvalue of the transformation stretch tensor as predicted by the theory was observed for the first time. We have also identified a new composition region of titanium-rich SMAs with potential for improved control of SMA properties.