Phase kinetics in modelling shape memory alloys

Mahapatra, D.R. and Melnik, R.V.N.

Nonsmooth/Nonconvex Mechanics with Applications in Engineering (II. NNMAE-2006). Proceedings of the International Conference in Memoriam of Prof. P.D. Panagiotopoulos, Ed. C.C. Baniotopoulos, ZITI, Thessaloniki, pp.131--138,  ISBN 960-243-623-9, 2006

Abstract:

In this paper we propose a Ginzburg-Landau free energy model of multivariant phase transformation in shape memory alloy and its linkage with the atomistic reordering process which finally gives rise to a self-accommodating microstructure. We analyze how the kinetics influences the computation of stress-temperature induced dynamics of phase transformation in microscopic and larger length scales without attempting to solve a molecular dynamic problem in a coupled manner. Based on the variational formulation of the problem

Keywords: Landau-Ginzburg free energy; Ni-Al thin films; phase transformation; multi-scale problems; shape memory alloys; self-accommodating microstructures; dynamics; computational analysis; coupled problems

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