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Article: Polycrystal deformation in a discrete dislocation dynamics framework

TitlePolycrystal deformation in a discrete dislocation dynamics framework
Authors
KeywordsDiscrete dislocation dynamics
Polycrystals
Grain boundary sliding
Issue Date2014
Citation
Acta Materialia, 2014, v. 75, p. 92-105 How to Cite?
AbstractGrain boundaries (GBs) typically play an important role in obstructing the glide of dislocations in polycrystalline materials, giving rise to the classic Hall-Petch effect. Molecular dynamics simulations of the deformation of nanocrystalline materials demonstrate that GBs do much more. We extend the now classical discrete dislocation dynamics (DDD) simulation approach to account for GB sliding and the absorption, emission and transmission of lattice dislocations at GBs. This is done in a framework in which GB dislocations are nucleated and migrate along the GB in a manner that is an extension of the DDD formalism. We demonstrate that incorporation of a dislocation picture of GB dynamics allows all of these effects to competitively relax localized stress fields (such as from dislocation pileups) and act synergistically to modify the mechanical response of polycrystals - well beyond GBs simply blocking dislocation slip. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/303423
ISSN
2023 Impact Factor: 8.3
2023 SCImago Journal Rankings: 2.916
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorQuek, Siu Sin-
dc.contributor.authorWu, Zhaoxuan-
dc.contributor.authorZhang, Yong Wei-
dc.contributor.authorSrolovitz, David J.-
dc.date.accessioned2021-09-15T08:25:17Z-
dc.date.available2021-09-15T08:25:17Z-
dc.date.issued2014-
dc.identifier.citationActa Materialia, 2014, v. 75, p. 92-105-
dc.identifier.issn1359-6454-
dc.identifier.urihttp://hdl.handle.net/10722/303423-
dc.description.abstractGrain boundaries (GBs) typically play an important role in obstructing the glide of dislocations in polycrystalline materials, giving rise to the classic Hall-Petch effect. Molecular dynamics simulations of the deformation of nanocrystalline materials demonstrate that GBs do much more. We extend the now classical discrete dislocation dynamics (DDD) simulation approach to account for GB sliding and the absorption, emission and transmission of lattice dislocations at GBs. This is done in a framework in which GB dislocations are nucleated and migrate along the GB in a manner that is an extension of the DDD formalism. We demonstrate that incorporation of a dislocation picture of GB dynamics allows all of these effects to competitively relax localized stress fields (such as from dislocation pileups) and act synergistically to modify the mechanical response of polycrystals - well beyond GBs simply blocking dislocation slip. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.-
dc.languageeng-
dc.relation.ispartofActa Materialia-
dc.subjectDiscrete dislocation dynamics-
dc.subjectPolycrystals-
dc.subjectGrain boundary sliding-
dc.titlePolycrystal deformation in a discrete dislocation dynamics framework-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.actamat.2014.04.063-
dc.identifier.scopuseid_2-s2.0-84901386045-
dc.identifier.volume75-
dc.identifier.spage92-
dc.identifier.epage105-
dc.identifier.isiWOS:000340854200007-

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