Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session Heterogeneous Nucleation and Initial Evolution of Microstructure - Poster
MM 23.8: Poster
Dienstag, 24. März 2009, 14:45–16:30, P4
Elastic effects on heterogeneous nucleation and microstructure formation — •Robert Spatschek1, Efim Brener2, Michael Fleck2, Clemens Gugenberger2, Claas Hüter2, Heiner Müller-Krumbhaar2, Denis Pilipenko2, and Alain Karma3 — 1ICAMS, Ruhr-Universität Bochum — 2IFF-3, Forschungszentrum Jülich — 3Northeastern University Boston
Elastic effects due to lattice strain modify the local equilibrium conditions at solid-solid interfaces compared to classical dendritic growth. We present results on the influence of dilatational and shear strain on the kinetics of these phase transitions and discuss its relevance for the selection properties.
The description of surface-diffusion controlled dynamics via the phase-field method is less trivial than it appears at first sight. Numerical simulations of a standard and a more sophisticated model from the literature as well as of two new models are performed to assess the relative merits of each approach.
On small scales, the overlap of interface profiles can lead to attractive and repulsive forces, which are important for the understanding of heterogeneous nucleation processes. They are related to lattice incompatibilities due to a misorientation or grain shifts, and provoke elastic deformations and the formation of dislocations. Using concepts from the classical density functional theory and amplitude equations we shed light on the forces between solid-melt interfaces on an analytical and numerical level.