Dynamic solidification of a binary melt

Physics

Scientific paper

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Binary Alloys, Crystallization, Melts (Crystal Growth), Solidification, Cooling, Eutectic Alloys, Liquid-Solid Interfaces, Phase Diagrams, Temperature Profiles

Scientific paper

Some simple experimental and associated theoretical models for the cooling and crystallization at a horizontal boundary of an initially homogeneous fluid are studied. The phase diagram of the solid/melt mixture is briefly discussed, and the effects associated with cooling and solidifying a melt from below are examined. The rate of solidification if the solid/melt interface is perfectly flat and horizontal is theoretically determined, and the criterion for which the interface becomes unstable is evaluated. Ice with unstable interfaces from different aqueous solutions was grown, and a simple theoretical model whose predictions are in good agreement with observations is developed. Theoretical and experimental relationships for the rate of growth of the crystal block, the total volume of solid produced, and an expression for the volume fraction of the solid product are presented.

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