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MM: Fachverband Metall- und Materialphysik
MM 30: Phase transitions III
MM 30.4: Vortrag
Donnerstag, 29. März 2007, 11:00–11:15, H4
Influence of Strain on Phase Transitions in Solids — •Robert Spatschek1, Efim Brener1, and Vladimir Marchenko2 — 1Institut für Festkörperforschung, Forschungszentrum 52425 Jülich — 2P.L. Kapitza Institute for Physical Problems, RAS 119334, Kosygina 2, Moscow, Russia
Many magnetic, superconducting and structural phase transitions in solids are accompanied by small lattice distortions which lead to the presence of elastic deformations. In some cases, these effects are of minor influence and can be ignored, but nevertheless for many applications the elastic strain causes qualitatively new and observable effects.
We consider a sharp interface kinetic model of phase transitions accompanied by elastic strain, together with its phase-field realization. Quantitative results for the steady-state growth of a new phase in a strip geometry are obtained and different pattern formation processes in this system are investigated. We consider the case of a dilatational mismatch and a transition in hexagonal crystals involving shear strain as particular applications of this minimum model.