The concern of elasticity in stress-induced martensitic transformation in NiTi
The concern of elasticity in stress-induced martensitic transformation in NiTi
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DOI：
10.1016/s0921-5093(98)00959-9
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发表时间：
1999-02-01
期刊：
影响因子：
6.4
通讯作者：
Yang, H
中科院分区：
文献类型：
--
作者：
Liu, YO;Yang, H
文献报道，近等原子NiTi的奥氏体相和马氏体相的弹性模差往往相差3倍。根据热力学原理，预计两相之间的相变可能是通过施加应力而引起的。这是因为弹性模数变化引起的弹性能差是相变的驱动力，类似于马氏体晶格变形对相变的影响。导出了描述这一效应的热力学方程。基于对这一方程的理解，如果热弹性马氏体相变涉及弹性模数的较大变化，则可以预期该相变的临界应力与温度之间的关系是非线性的。因此，该方程可用于两个目的之一：阐明实验确定的两相弹性系数的可靠性，或验证临界应力与转变温度之间的Clausius-Clapeyron关系。(C)1999 Elsevier Science S.A.保留所有权利。
It has been reported in the literature that moduli of elasticity of the austenite and martensite of near-equiatomic NiTi differ often by a factor of 3. It is expected that a phase transformation between the two phases may be induced by the application of a stress, according to thermodynamic principles. This is due to the fact that the difference in elastic energy caused by the change in modulus of elasticity serves as a driving force for the transformation, similar to the effect of the lattice distortion of the martensite on the transformation. A thermodynamic equation expressing this effect is derived. It is expected, based on the understanding of this equation, that the relationship between the critical stress and the temperature for a thermoelastic martensitic transformation is non-linear if the transformation involves a large change in modulus of elasticity. Therefore, this equation may be used for either of two purposes: to clarify the reliability of the experimentally determined moduli of elasticity of the two phases or to verify the Clausius-Clapeyron relation between the critical stress and the temperature for the transformation. (C) 1999 Elsevier Science S.A. All rights reserved.