Controlling solid-liquid interfacial energy anisotropy through the isotropic liquid.

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 [Formula: see text] to [Formula: see text] 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang L,Hoyt JJ,Wang N,Provatas N,Sinclair CW

doi

10.1038/s41467-020-14530-7

subject

Has Abstract

pub_date

2020-02-05 00:00:00

pages

724

issue

1

issn

2041-1723

pii

10.1038/s41467-020-14530-7

journal_volume

11

pub_type

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