Controlling solid-liquid interfacial energy anisotropy through the isotropic liquid

Lei Wang (), Jeffrey J. Hoyt, Nan Wang, Nikolas Provatas and Chad W. Sinclair
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Lei Wang: The University of British Columbia
Jeffrey J. Hoyt: McMaster University
Nan Wang: Northwestern Polytechnical University
Nikolas Provatas: McGill University
Chad W. Sinclair: The University of British Columbia

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Although the anisotropy of the solid-liquid interfacial free energy for most alloy systems is very small, it plays a crucial role in the growth rate, morphology and crystallographic growth direction of dendrites. Previous work posited a dendrite orientation transition via compositional additions. In this work we examine experimentally the change in dendrite growth behaviour in the Al-Sm (Samarium) system as a function of solute concentration and study its interfacial properties using molecular dynamics simulations. We observe a dendrite growth direction which changes from $$\langle 100\rangle$$⟨100⟩ to $$\langle 110\rangle$$⟨110⟩ as Sm content increases. The observed change in dendrite orientation is consistent with the simulation results for the variation of the interfacial free energy anisotropy and thus provides definitive confirmation of a conjecture in previous works. In addition, our results provide physical insight into the atomic structural origin of the concentration dependent anisotropy, and deepen our fundamental understanding of solid-liquid interfaces in binary alloys.

Date: 2020
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DOI: 10.1038/s41467-020-14530-7

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