Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster session

MM 20.50: Poster

Dienstag, 27. März 2007, 14:45–18:00, Poster C

A phase-field model to Investigate heterogeneous nucleation in peritectic materials — •Ricardo S. Siquieri¹ and Heike Emmerich² — ¹siquieri@ghi.rwth-aachen.de — ²emmerich@ghi.rwth-aachen.de

Here we propose a phase-field approach to investigate the influence of convection on peritectic growth as well as the heterogeneous nucleation kinetics of peritectic systems. For this purpose we derive a phase-field model for peritectic growth taking into account fluid flow in the melt, which is convergent to the underlying sharp interface problem in the thin interface limit. Moreover, we employ our new phase-field model to study the heterogeneous nucleation kinetics of peritectic material systems. Our approach is based on a similar approach towards homogeneous nucleation in (Phys. Rev. Let. 88 20 (2002)). We applied our model successfully to extend the nucleation rate predicted by classical nucleation theory for an additional morphological term relevant for peritectic growth. Further applications to understand the mechanisms and consequences of heterogeneous nucleation kinetics in more detail are discussed.