Abstract
Mass transfer in a high temperature gradient was studied in directionally melted Al-4.8 wt% Cu alloys. The ratio of the times spent to attain the final and thermal state is about 25. Mass transfer in the solid is influenced by the coexistence of the liquid and the solid, and is faster than the volume diffusion. The decrease of the liquid volume in the solid is explained with a mechanism, which consists of the migration in the saturated solid under the temperature gradient, the shrinkage in the unsaturated solid and the drift upwards by the interfacial tension.
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