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Article: Modeling dislocation-grain boundary interactions through gradient plasticity and nanoindentation

TitleModeling dislocation-grain boundary interactions through gradient plasticity and nanoindentation
Authors
KeywordsHall-Petch Relation
Nanoindentation
Size Effects
Strain-Gradient Plasticity
Issue Date2007
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/msea
Citation
Materials Science And Engineering A, 2007, v. 459 n. 1-2, p. 251-261 How to Cite?
AbstractBy considering an interface energy term in gradient plasticity an "interfacial" yield criterion, indicating the stress at which the interface begins to deform plastically can be developed. From an experimental point of view interfacial yielding has been observed during nanoindentation on an Fe-2.2weight% Si bi-crystal and a Nb polycrystal. In the present study after illustrating the interaction of a grain boundary with the grain interior for a plastically deforming bi-crystal the theoretically determined interfacial yield stress expression is fit to the nanoindentation data for Fe-2.2% Si and Nb. This fit allows first estimates to be obtained for the internal length, a key material parameter that comes into play in all gradient theories. Based on the predicted values the internal length is physically related to the dislocation source distance. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156888
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.803
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorAifantis, KEen_US
dc.contributor.authorNgan, AHWen_US
dc.date.accessioned2012-08-08T08:44:26Z-
dc.date.available2012-08-08T08:44:26Z-
dc.date.issued2007en_US
dc.identifier.citationMaterials Science And Engineering A, 2007, v. 459 n. 1-2, p. 251-261en_US
dc.identifier.issn0921-5093en_US
dc.identifier.urihttp://hdl.handle.net/10722/156888-
dc.description.abstractBy considering an interface energy term in gradient plasticity an "interfacial" yield criterion, indicating the stress at which the interface begins to deform plastically can be developed. From an experimental point of view interfacial yielding has been observed during nanoindentation on an Fe-2.2weight% Si bi-crystal and a Nb polycrystal. In the present study after illustrating the interaction of a grain boundary with the grain interior for a plastically deforming bi-crystal the theoretically determined interfacial yield stress expression is fit to the nanoindentation data for Fe-2.2% Si and Nb. This fit allows first estimates to be obtained for the internal length, a key material parameter that comes into play in all gradient theories. Based on the predicted values the internal length is physically related to the dislocation source distance. © 2007 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/mseaen_US
dc.relation.ispartofMaterials Science and Engineering Aen_US
dc.subjectHall-Petch Relationen_US
dc.subjectNanoindentationen_US
dc.subjectSize Effectsen_US
dc.subjectStrain-Gradient Plasticityen_US
dc.titleModeling dislocation-grain boundary interactions through gradient plasticity and nanoindentationen_US
dc.typeArticleen_US
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_US
dc.identifier.authorityNgan, AHW=rp00225en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.msea.2007.01.028en_US
dc.identifier.scopuseid_2-s2.0-34247092926en_US
dc.identifier.hkuros142706-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34247092926&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume459en_US
dc.identifier.issue1-2en_US
dc.identifier.spage251en_US
dc.identifier.epage261en_US
dc.identifier.isiWOS:000246729300036-
dc.publisher.placeSwitzerlanden_US
dc.identifier.scopusauthoridAifantis, KE=9635322600en_US
dc.identifier.scopusauthoridNgan, AHW=7006827202en_US

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