Abstract
The rapid directional solidification of a binary alloy is studied with the phase-field model. An oscillatory instability is evidenced which originates alternating low and high concentration solute bands. This instability, which is related to the banded structure observed in rapid solidification experiments, is predicted by previous studies conducted within the free-boundary formulation of the problem, incorporating nonequilibrium effects as solute trapping. In the present paper the governing equations of the model are numerically solved to show under what conditions (i.e., isotherm velocity and temperature gradient) the banded structure can be observed.
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