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Article: Interface faceting–defaceting mediated by disconnections

TitleInterface faceting–defaceting mediated by disconnections
Authors
KeywordsContinuum modeling
Disconnections
faceting–defaceting transition
Grain boundaries
Interface migration
Issue Date29-Mar-2023
PublisherElsevier
Citation
Acta Materialia, 2023, v. 251 How to Cite?
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.


Persistent Identifierhttp://hdl.handle.net/10722/331863
ISSN
2023 Impact Factor: 8.3
2023 SCImago Journal Rankings: 2.916
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorQiu, Caihao-
dc.contributor.authorSalvalaglio, Marco-
dc.contributor.authorSrolovitz, David J-
dc.contributor.authorHan, Jian-
dc.date.accessioned2023-09-28T04:59:11Z-
dc.date.available2023-09-28T04:59:11Z-
dc.date.issued2023-03-29-
dc.identifier.citationActa Materialia, 2023, v. 251-
dc.identifier.issn1359-6454-
dc.identifier.urihttp://hdl.handle.net/10722/331863-
dc.description.abstract<p>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 <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/interface-thermodynamics" title="Learn more about interface thermodynamics from ScienceDirect's AI-generated Topic Pages">interface thermodynamics</a> and kinetics applied to embedded particles/grains, steady-state interface migration geometries, and nominally flat interfaces.<br></p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofActa Materialia-
dc.subjectContinuum modeling-
dc.subjectDisconnections-
dc.subjectfaceting–defaceting transition-
dc.subjectGrain boundaries-
dc.subjectInterface migration-
dc.titleInterface faceting–defaceting mediated by disconnections-
dc.typeArticle-
dc.identifier.doi10.1016/j.actamat.2023.118880-
dc.identifier.scopuseid_2-s2.0-85152593763-
dc.identifier.volume251-
dc.identifier.eissn1873-2453-
dc.identifier.isiWOS:000975594500001-
dc.identifier.issnl1359-6454-

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