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MM: Metall- und Materialphysik

MM 5: Phase transitions II

MM 5.3: Vortrag

Montag, 27. März 2006, 12:15–12:30, IFW D

Solute trapping during rapid solidification of alloys: A phase-field study — •Denis Danilov and Britta Nestler — Karlsruhe University of Applied Sciences, Karlsruhe, Germany

The effect of nonequilibrium solute trapping by growing solid under rapid solidification conditions is studied by 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 to a better description of the available experimental data, especially at high growth velocities, in comparison with other diffuse-interface and sharp-interface predictions.