A lattice-based model of the kinetics of twin boundary motion |
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Authors: | Rohan Abeyaratne Srikanth Vedantam |
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Affiliation: | Massachusetts Institute of Technology, Cambridge, MA 02139, USA |
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Abstract: | In this paper we derive a macroscopic kinetic law for twin boundary motion from a lattice dynamical model. The model is developed for compound and type-1 twins and it is explicitly illustrated for a Cu-Al-Ni shape memory alloy. The governing multiple-well energy is calculated using an effective interatomic potential; a Frenkel-Kontorowa type model is developed for the dynamics at the lattice scale; and a quasi-continuum approximation is used to determine the continuum-scale kinetics. The model predicts that compound twins in the Cu-Al-Ni shape memory alloy are an order of magnitude more mobile than type-1 twins which is consistent with experimental observations. |
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Keywords: | A. Dynamics Kinetics Phase transformation Twinning B. Constitutive behavior Lattice |
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