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MM: Fachverband Metall- und Materialphysik

MM 20: Poster session

MM 20.22: Poster

Tuesday, March 27, 2007, 14:45–18:00, Poster C

Phase-field modelling of solute trapping during rapid solidification of a Si--As alloy — Denis Danilov and •Britta Nestler — Institute for Computational Engineering, Karlsruhe University of Applied Sciences, Karlsruhe, Germany

The effect of nonequilibrium solute trapping by a growing solid under rapid solidification conditions is studied using a phase-field model. Considering a continuous steady-state concentration profile across the diffuse solid-liquid interface, a new definition of the nonequilibrium partition coefficient in the phase-field context is introduced. This definition leads, in particular for high growth velocities, to a better description of the available experimental data in comparison with other diffuse interface and sharp-interface predictions.