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Article: The inverse hall-petch relation in nanocrystalline metals: A discrete dislocation dynamics analysis

TitleThe inverse hall-petch relation in nanocrystalline metals: A discrete dislocation dynamics analysis
Authors
KeywordsDiscrete dislocation dynamics
Grain boundary sliding
Polycrystals
Inverse Hall-Petch
Issue Date2016
Citation
Journal of the Mechanics and Physics of Solids, 2016, v. 88, p. 252-266 How to Cite?
AbstractWhen the grain size in polycrystalline materials is reduced to the nanometer length scale (nanocrystallinity), observations from experiments and atomistic simulations suggest that the yield strength decreases (softening) as the grain size is decreased. This is in contrast to the Hall-Petch relation observed in larger sized grains. We incorporated grain boundary (GB) sliding and dislocation emission from GB junctions into the classical DDD framework, and recovered the smaller is weaker relationship observed in nanocrystalline materials. This current model shows that the inverse Hall-Petch behavior can be obtained through a relief of stress buildup at GB junctions from GB sliding by emitting dislocations from the junctions. The yield stress is shown to vary with grain size, d, by a d1/2 relationship when grain sizes are very small. However, pure GB sliding alone without further plastic accomodation by dislocation emission is grain size independent.
Persistent Identifierhttp://hdl.handle.net/10722/303477
ISSN
2023 Impact Factor: 5.0
2023 SCImago Journal Rankings: 1.632
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorQuek, Siu Sin-
dc.contributor.authorChooi, Zheng Hoe-
dc.contributor.authorWu, Zhaoxuan-
dc.contributor.authorZhang, Yong Wei-
dc.contributor.authorSrolovitz, David J.-
dc.date.accessioned2021-09-15T08:25:23Z-
dc.date.available2021-09-15T08:25:23Z-
dc.date.issued2016-
dc.identifier.citationJournal of the Mechanics and Physics of Solids, 2016, v. 88, p. 252-266-
dc.identifier.issn0022-5096-
dc.identifier.urihttp://hdl.handle.net/10722/303477-
dc.description.abstractWhen the grain size in polycrystalline materials is reduced to the nanometer length scale (nanocrystallinity), observations from experiments and atomistic simulations suggest that the yield strength decreases (softening) as the grain size is decreased. This is in contrast to the Hall-Petch relation observed in larger sized grains. We incorporated grain boundary (GB) sliding and dislocation emission from GB junctions into the classical DDD framework, and recovered the smaller is weaker relationship observed in nanocrystalline materials. This current model shows that the inverse Hall-Petch behavior can be obtained through a relief of stress buildup at GB junctions from GB sliding by emitting dislocations from the junctions. The yield stress is shown to vary with grain size, d, by a d1/2 relationship when grain sizes are very small. However, pure GB sliding alone without further plastic accomodation by dislocation emission is grain size independent.-
dc.languageeng-
dc.relation.ispartofJournal of the Mechanics and Physics of Solids-
dc.subjectDiscrete dislocation dynamics-
dc.subjectGrain boundary sliding-
dc.subjectPolycrystals-
dc.subjectInverse Hall-Petch-
dc.titleThe inverse hall-petch relation in nanocrystalline metals: A discrete dislocation dynamics analysis-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jmps.2015.12.012-
dc.identifier.scopuseid_2-s2.0-84956812535-
dc.identifier.volume88-
dc.identifier.spage252-
dc.identifier.epage266-
dc.identifier.isiWOS:000370455000015-

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