期刊
ACTA MATERIALIA
卷 54, 期 8, 页码 2109-2120出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2005.12.040
关键词
shape memory alloys; martensitic phase transformation; microstructure; modelling; nucleation
We present three-dimensional simulations of the microstructure and mechanical response of shape memory alloys undergoing cubic to tetragonal transitions, using FePd as an example. The simulations are based on a nonlinear elastic free-energy in terms of the appropriate strain fields. The dynamics is simulated by force balance equations for the displacement fields with a damping term derived from a dissipation function. Stress-strain properties in the pseudoelastic as well as the shape memory regime are investigated using strain loading. We also study the effects of defect-induced heterogeneous nucleation and motion of twin boundaries during deformation. Thus, we probe the influence of the microstructure on the mechanical response and investigate how the stress-strain behavior changes as a function of strain rate. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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