Phase-field modeling of martensitic microstructure in NiTi shape memory alloys
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چکیده
A phase-field model is developed to study the cubic to monoclinic martensitic phase transformation in nickel–titanium (NiTi) shape memory alloys. Three-dimensional phase-field simulations show the nucleation and growth of monoclinic B190 multivariants that form a polytwinned martensitic microstructure. Parametric studies demonstrate that mechanical constraints and crystallographic orientation govern the patterning of martensitic twin variants in the formation of strain-accommodating microstructures. Pairing of twin variants is studied by comparing the phase-field simulation results with the crystallographic solutions of compatible twins. The phase-field method developed in this work is generally applicable to simulate the dynamic microstructure evolution of metals and alloys that produce lowsymmetry phases through martensitic transformation. 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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تاریخ انتشار 2014