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Article: Triple junction drag effects during topological changes in the evolution of polycrystalline microstructures

TitleTriple junction drag effects during topological changes in the evolution of polycrystalline microstructures
Authors
KeywordsTriple junction angle
Drag effect
Triple junction motion
T1 process
T3 process
Grain boundary
Issue Date2017
Citation
Acta Materialia, 2017, v. 128, p. 345-350 How to Cite?
AbstractExperiments, theory and atomistic simulations show that finite triple junction mobility results in non-equilibrium triple junction angles in evolving polycrystalline systems. These angles have been predicted and verified for cases where grain boundary migration is steady-state. Yet, steady-state never occurs during the evolution of polycrystalline microstructures as a result of changing grain size and topological events (e.g., grain face/edge switching - “T1” process, or grain disappearance “T2” or “T3” processes). We examine the non-steady evolution of the triple junction angle in the vicinity of topological events and show that large deviations from equilibrium and/or steady-state angles occur. We analyze $∖tau$ the characteristic relaxation time of triple junction angles τ by consideration of a pair of topological events, beginning from steady-state migration. Using numerical results and theoretical analysis we predict how the triple junction angle varies with time and how τ varies with triple junction mobility. We argue that it is precisely those cases where grain boundaries are moving quickly (e.g., topological process in nanocrystalline materials), that the classical steady-state prediction of the triple junction angle about finite triple junction mobility is inapplicable and may only be applied qualitatively.
DescriptionAccepted manuscript is available on the publisher website.
Persistent Identifierhttp://hdl.handle.net/10722/303511
ISSN
2023 Impact Factor: 8.3
2023 SCImago Journal Rankings: 2.916
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhao, Quan-
dc.contributor.authorJiang, Wei-
dc.contributor.authorSrolovitz, David J.-
dc.contributor.authorBao, Weizhu-
dc.date.accessioned2021-09-15T08:25:28Z-
dc.date.available2021-09-15T08:25:28Z-
dc.date.issued2017-
dc.identifier.citationActa Materialia, 2017, v. 128, p. 345-350-
dc.identifier.issn1359-6454-
dc.identifier.urihttp://hdl.handle.net/10722/303511-
dc.descriptionAccepted manuscript is available on the publisher website.-
dc.description.abstractExperiments, theory and atomistic simulations show that finite triple junction mobility results in non-equilibrium triple junction angles in evolving polycrystalline systems. These angles have been predicted and verified for cases where grain boundary migration is steady-state. Yet, steady-state never occurs during the evolution of polycrystalline microstructures as a result of changing grain size and topological events (e.g., grain face/edge switching - “T1” process, or grain disappearance “T2” or “T3” processes). We examine the non-steady evolution of the triple junction angle in the vicinity of topological events and show that large deviations from equilibrium and/or steady-state angles occur. We analyze $∖tau$ the characteristic relaxation time of triple junction angles τ by consideration of a pair of topological events, beginning from steady-state migration. Using numerical results and theoretical analysis we predict how the triple junction angle varies with time and how τ varies with triple junction mobility. We argue that it is precisely those cases where grain boundaries are moving quickly (e.g., topological process in nanocrystalline materials), that the classical steady-state prediction of the triple junction angle about finite triple junction mobility is inapplicable and may only be applied qualitatively.-
dc.languageeng-
dc.relation.ispartofActa Materialia-
dc.subjectTriple junction angle-
dc.subjectDrag effect-
dc.subjectTriple junction motion-
dc.subjectT1 process-
dc.subjectT3 process-
dc.subjectGrain boundary-
dc.titleTriple junction drag effects during topological changes in the evolution of polycrystalline microstructures-
dc.typeArticle-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1016/j.actamat.2017.02.010-
dc.identifier.scopuseid_2-s2.0-85013848649-
dc.identifier.volume128-
dc.identifier.spage345-
dc.identifier.epage350-
dc.identifier.isiWOS:000397692600035-

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