Atomistic underpinnings for orientation selection in alloy dendritic growth

Atomistic underpinnings for orientation selection in alloy dendritic growth

In dendritic solidification, growth morphologies often display a pronounced sensitivity to small changes in composition. To gain insight into the origins of this phenomenon, we undertake an atomistic calculation of the magnitude and anisotropy of the crystal-melt interfacial free energy in a model a...

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Veröffentlicht in:Physical review letters 2007-03, Vol.98 (12), p.125701-125701, Article 125701
Hauptverfasser: Becker, C A, Olmsted, D, Asta, M, Hoyt, J J, Foiles, S M
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container_title Physical review letters
container_volume 98
creator Becker, C A
Olmsted, D
Asta, M
Hoyt, J J
Foiles, S M
description In dendritic solidification, growth morphologies often display a pronounced sensitivity to small changes in composition. To gain insight into the origins of this phenomenon, we undertake an atomistic calculation of the magnitude and anisotropy of the crystal-melt interfacial free energy in a model alloy system featuring no atomic size mismatch and relatively ideal solution thermodynamics. By comparing the results of these calculations with predictions from recent phase-field calculations, we demonstrate that alloying gives rise to changes in free-energy anisotropies that are substantial on the scale required to induce changes in growth orientations.
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title Atomistic underpinnings for orientation selection in alloy dendritic growth
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