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Rapid solidification of levitation melted Ni-Sn alloy droplets with high undercooling

Yuh Shiohara, M. C. Flemings, Yanzhong Wu, T. J. Piccone

Abstract

Experimental results obtained by high-speed optical temperature sensing for the rapid solidification of highly undercooled, levitation-melted Ni-Sn alloy droplets are presented. These data suggest a solidification model proceeding according to overlapping steps: (1) dendritic growth within the bulk undercooled melt, (2) continued recalescence as supersaturation of the interdendritic liquid dissipates, (3) fine-scale remelting within the dendrites, (4) ripening of the fine structure, and (5) solidification of remaining liquid at the end of recalescence.

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Available abstract

Key concepts: Recalescence, Supercooling, Levitation, Materials science, Supersaturation, Alloy, Metallurgy, Dendrite (mathematics)