The concern of elasticity in stress-induced martensitic transformation in NiTi |
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Authors: | Yinong Liu Hong Yang |
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Affiliation: | Department of Mechanical and Materials Engineering, University of Western Australia, Nedlands, WA 6907, Australia |
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Abstract: | 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. |
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Keywords: | Martensite Elasticity Clausius–Clapeyron relation NiTi Thermodynamics Stress-induced transformation |
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