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Article: Dislocation nucleation in the initial stage during nanoindentation

TitleDislocation nucleation in the initial stage during nanoindentation
Authors
Issue Date2003
PublisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp
Citation
Philosophical Magazine, 2003, v. 83 n. 31-34, p. 3609-3622 How to Cite?
AbstractThe microstructure origin of the elastic-plastic response of a Cu substrate during nanoindentation is studied using molecular dynamics simulation. The elastic response is found to deviate from the Hertzian solution observed experimentally. The departure can be traced to the small tip radius used in the simulation. Further penetration sees the development of an inhomogeneous microstructure. Even at the same strain rate, different parts of the contact surface deform via different mechanisms: some elastically, some via the dislocation bow-out and some via the nucleation and growth of Shockley partials that sometimes interact to form stair-rod locks. The resultant effect produces the observed quasi-elastic behaviour on the load-displacement curve, characterized by interspersed minor yields. The present computer simulation shows in some detail the corresponding dislocation structure development. The stair-rod lock formation is found to provide a more satisfactory explanation to the experimentally observed time-delayed occurrence of pop-in below the spontaneous pop-in load.
Persistent Identifierhttp://hdl.handle.net/10722/76100
ISSN
2015 Impact Factor: 1.632
2015 SCImago Journal Rankings: 0.953
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiang, HYen_HK
dc.contributor.authorWoo, CHen_HK
dc.contributor.authorHuang, Hen_HK
dc.contributor.authorNgan, AHWen_HK
dc.contributor.authorYu, TXen_HK
dc.date.accessioned2010-09-06T07:17:38Z-
dc.date.available2010-09-06T07:17:38Z-
dc.date.issued2003en_HK
dc.identifier.citationPhilosophical Magazine, 2003, v. 83 n. 31-34, p. 3609-3622en_HK
dc.identifier.issn1478-6435en_HK
dc.identifier.urihttp://hdl.handle.net/10722/76100-
dc.description.abstractThe microstructure origin of the elastic-plastic response of a Cu substrate during nanoindentation is studied using molecular dynamics simulation. The elastic response is found to deviate from the Hertzian solution observed experimentally. The departure can be traced to the small tip radius used in the simulation. Further penetration sees the development of an inhomogeneous microstructure. Even at the same strain rate, different parts of the contact surface deform via different mechanisms: some elastically, some via the dislocation bow-out and some via the nucleation and growth of Shockley partials that sometimes interact to form stair-rod locks. The resultant effect produces the observed quasi-elastic behaviour on the load-displacement curve, characterized by interspersed minor yields. The present computer simulation shows in some detail the corresponding dislocation structure development. The stair-rod lock formation is found to provide a more satisfactory explanation to the experimentally observed time-delayed occurrence of pop-in below the spontaneous pop-in load.en_HK
dc.languageengen_HK
dc.publisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.aspen_HK
dc.relation.ispartofPhilosophical Magazineen_HK
dc.titleDislocation nucleation in the initial stage during nanoindentationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1478-6435&volume=83&spage=3609&epage=3622&date=2003&atitle=Dislocation+nucleation+in+the+initial+stage+during+nanoindentationen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1080/14786430310001605579en_HK
dc.identifier.scopuseid_2-s2.0-0348221887en_HK
dc.identifier.hkuros88660en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0348221887&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume83en_HK
dc.identifier.issue31-34en_HK
dc.identifier.spage3609en_HK
dc.identifier.epage3622en_HK
dc.identifier.isiWOS:000187602900009-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiang, HY=7402853728en_HK
dc.identifier.scopusauthoridWoo, CH=26423402100en_HK
dc.identifier.scopusauthoridHuang, H=7405612816en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.scopusauthoridYu, TX=13105002800en_HK
dc.identifier.citeulike11275209-

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