Diffusion kinetics and multivariant phase transformation in shape memory alloys

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

Fracture of Nano and Engineering Materials and Structures. Proceedings of the 16th European Conference on Fracture (July 3-7, 2006), Ed. E.E. Gdoutos, Springer [Special Symposium on Fracture and Fatigue at the Micro and Nano Scales, Organizers: H.D. Espinosa and I. Daniel], Paper 737, 8 pages, ISBN 1-4020-4971-4, 2006 (also in hard copy ISBN 10-4020-4971-4/13-978-1-4020-4971-2)

Abstract:

We develop a general modeling framework to analyze the dynamics of multivariant phase transformation in three-dimensional samples of shape memory materials. The model is based on a systematic representation of the Gibbs free energy in stress, temperature and n-dimensional order parameter space.

Keywords: multi-scale problems; spatio-temporal fluctuations due to atomic reordering; shape memory alloys; thermodynamic conservation laws; Gibbs free energy; multi-dimensional phase transformations