Abstract
The evolution of cellular patterns at the solid-liquid interface was investigated in directional solidification of the transparent alloy succinonitrile-acetone in bulk samples under microgravity conditions on Space-Shuttle missions and different processing parameters. Interface morphologies are observed from the top within a Bridgman-Stockbarger type furnace. A hexagonal arrangement of cells on the interface with irregularities was found in all cases. The cell spacings distribution is best described using the numerical model by Lu/Hunt. Comparisons with numerical phase-field simulations and weakly-nonlinear stability analysis also show good agreement.
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