Abstract
Observations of the macroscopic shape of the solid-liquid interface and radial solute segregation have been carried out on quenched Pb-30 wt%TI alloys which were grown upwards, that is, for the case for which thermosolutal convection may take place. The solidification front exhibits a structure which is composed of solid plateaux separated by liquid channels and whose amplitude presents a maximum when plotted versus growth rate, which suggests a concomitant maximum in the level of thermosolutal convection. The convective flow adjacent to the solidification front has then been deduced.
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