Abstract
A phase-field model for the phase transition between austenite and martensite and twinning between two martensitic variants is presented from our previous theory [1] with the main focus on the influence of interfacial stress that is consistent with the sharp interface limit. Each variant-variant transformation can be represented by only one order parameter. Thus, it allows us to get the analytical solution of interface energy and width. Coupled phase-field and elasticity equations are solved for cubic-to-tetragonal phase transformation in NiAl shape memory alloy. The effects of interfacial stress are studied for martensite-martensite interfaces in detail, which was absent in [1]. Additionally, stress and temperature-induced growth of the martensitic phase inside austenite and twining are simulated. Some of the nontrivial experimentally observed microstructures reproduced in the simulations [1] are analyzed in detail. It includes tip splitting and bending, and twins crossing. This theory can be extended for electric, reconstructive, and magnetic phase transformations.
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Acknowledgments
I am grateful to Dr. V.I. Levitas from Iowa State University for his kind guidance and assistance.
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This work was supported by the Los Alamos National Laboratory (contract no. 104321) and the U.S. National Science Foundation (grant no. CMMI-0969143).
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Roy, A.M. Influence of Interfacial Stress on Microstructural Evolution in NiAl Alloys. Jetp Lett. 112, 173–179 (2020). https://doi.org/10.1134/S0021364020150023
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DOI: https://doi.org/10.1134/S0021364020150023