Interface faceting–defaceting mediated by disconnections

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Article number118880
Number of pages10
Journal / PublicationActa Materialia
Volume251
Online published29 Mar 2023
Publication statusPublished - 1 Jun 2023

Abstract

An intrinsic feature of nearly all internal interfaces in crystalline systems (homo- and hetero-phase) is the presence of disconnections, namely topological line defects constrained to the interface that have both step and dislocation character. We demonstrate that elastic interactions between disconnections strongly affect the morphology and motion of interfaces, allowing for understanding and reconciling diverse key experiments. In particular, these elastic interactions strongly modify equilibrium interface morphologies compared with those solely determined by anisotropic surface energy, and affect the kinetics of migrating interfaces. They are also found to lead to a thermodynamic, first-order, finite-temperature, faceting–defaceting transition. We demonstrate these phenomena through numerical simulations based upon a general, continuum disconnection-based model for interface thermodynamics and kinetics applied to embedded particles/grains, steady-state interface migration geometries, and nominally flat interfaces.

© 2023 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Research Area(s)

  • faceting–defaceting transition, Interface migration, Grain boundaries, Disconnections, Continuum modeling

Citation Format(s)

Interface faceting–defaceting mediated by disconnections. / Qiu, Caihao; Salvalaglio, Marco; Srolovitz, David J. et al.
In: Acta Materialia, Vol. 251, 118880, 01.06.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review