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Article: A new model for dislocation kink-pair activation at low temperatures based on the peierls-nabarro concept

TitleA new model for dislocation kink-pair activation at low temperatures based on the peierls-nabarro concept
Authors
Issue Date1999
PublisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp
Citation
Philosophical Magazine A: Physics Of Condensed Matter, Structure, Defects And Mechanical Properties, 1999, v. 79 n. 7, p. 1697-1720 How to Cite?
AbstractThe generation of double kinks in sessile screw dislocation cores is a highly nonlinear process but is the rate-controlling step for plasticity at low temperatures. In this work, double-kink generation in threefold screw dislocations in bcc crystals is studied within the framework of the Peierls-Nabarro (P-N) model in which the partial dislocations are described by non-singular displacement fields. The kink geometry is modelled by dividing the dislocation into elemental slabs, each of which is assumed to have its own displacement field calculated using the P-N model under the plane-strain condition. Explicit expressions for the apparent activation energy and volume have been obtained as a function of applied stress.
Persistent Identifierhttp://hdl.handle.net/10722/75688
ISSN
2004 Impact Factor: 2.136
2005 SCImago Journal Rankings: 1.171
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2010-09-06T07:13:36Z-
dc.date.available2010-09-06T07:13:36Z-
dc.date.issued1999en_HK
dc.identifier.citationPhilosophical Magazine A: Physics Of Condensed Matter, Structure, Defects And Mechanical Properties, 1999, v. 79 n. 7, p. 1697-1720en_HK
dc.identifier.issn0141-8610en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75688-
dc.description.abstractThe generation of double kinks in sessile screw dislocation cores is a highly nonlinear process but is the rate-controlling step for plasticity at low temperatures. In this work, double-kink generation in threefold screw dislocations in bcc crystals is studied within the framework of the Peierls-Nabarro (P-N) model in which the partial dislocations are described by non-singular displacement fields. The kink geometry is modelled by dividing the dislocation into elemental slabs, each of which is assumed to have its own displacement field calculated using the P-N model under the plane-strain condition. Explicit expressions for the apparent activation energy and volume have been obtained as a function of applied stress.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 Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Propertiesen_HK
dc.titleA new model for dislocation kink-pair activation at low temperatures based on the peierls-nabarro concepten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1478-6435&volume=79&spage=1697&epage=1720&date=1999&atitle=A+new+model+for+dislocation+kink-pair+activation+at+low+temperatures+based+on+the+Peierls-Nabarro+concepten_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1080/01418619908210387-
dc.identifier.scopuseid_2-s2.0-0039442589en_HK
dc.identifier.hkuros48988en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0039442589&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume79en_HK
dc.identifier.issue7en_HK
dc.identifier.spage1697en_HK
dc.identifier.epage1720en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK

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