Abstract
A microscale phase field model for the multivariant martensitic phase transformation is advanced and utilized for studying the pseudoelastic behavior of a thin film of equiatomic single crystal NiTi under tensile loading. The thermomechanical model includes the strain softening as a mechanism leading to strain (transformation) localization and discrete microstructure formation. To avoid a small scale limitation, gradient term is dropped. Numerical solutions have shown a negligible mesh sensitivity for different element shapes and densities, which is due to rate-dependent kinetic equations for phase transformation. Microstructure evolution and corresponding stress-strain curves are presented for several cases. Obtained stress-strain curves, band-like martensitic microstructure, a sudden drop in the stress at the beginning of the martensitic transformation, residual austenite, and multiple stress oscillations due to nucleation events are qualitatively similar to those in known experiments.
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Acknowledgements
The support of NSF (CMMI-1536925 and DMR-1434613), ARO (W911NF-17-1-0225), XSEDE (TG-MSS140033), and ISU (Schafer 2050 Challenge Professorship and Vance Coffman Faculty Chair Professorship) is gratefully acknowledged.
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© 2018 The Minerals, Metals & Materials Society
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Esfahani, S.E., Ghamarian, I., Levitas, V.I., Collins, P.C. (2018). Modeling the Microstructure Evolutions of NiTi Thin Film During Tension. In: Stebner, A., Olson, G. (eds) Proceedings of the International Conference on Martensitic Transformations: Chicago. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-76968-4_9
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DOI: https://doi.org/10.1007/978-3-319-76968-4_9
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