Critical point of martensitic transformation under stress in an Fe-31.2Pd (at.%) shape memory alloy
Critical point of martensitic transformation under stress in an Fe-31.2Pd (at.%) shape memory alloy
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DOI：
10.1080/14786435.2015.1029561
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发表时间：
2015-04
影响因子：
1.6
通讯作者：
F. Xiao;T. Fukuda;T. Kakeshita
中科院分区：
文献类型：
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作者：
F. Xiao;T. Fukuda;T. Kakeshita
本文研究了Fe-31.2Pd（at.%）在[0 0 1]方向上的相变应变Δε。形状记忆合金在相同方向上施加压应力。当无应力时，该合金在230 K下表现出立方马氏体到四方马氏体的相变，|Δε|的1.4%。随着应力的增加，相变温度线性增加，|Δε|在40 MPa（280 K）时，随压力的增大而线性减小，直至消失。该点是该变换的临界点，在该点处一阶性质消失，临界指数β被估计为0.47 ± 0.04。
We have examined the transformation strain, Δε, in the [0 0 1] direction of an Fe-31.2Pd (at.%) shape memory alloy under compressive stress applied in the same direction. When the stress is absent, the alloy exhibits a cubic to tetragonal martensitic transformation at 230 K with |Δε| of 1.4%. As the stress increases, the transformation temperature increases linearly and |Δε| decreases linearly and vanishes at 40 MPa (280 K). This point is the critical point of this transformation at which the first-order nature disappears, and the critical exponent β is evaluated to be 0.47 ± 0.04.