File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Delayed plasticity in nanoindentation of annealed crystals

TitleDelayed plasticity in nanoindentation of annealed crystals
Authors
Issue Date2006
PublisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp
Citation
Philosophical Magazine, 2006, v. 86 n. 9, p. 1287-1304 How to Cite?
AbstractContinuum constitutive relations used in the design of macro-sized components assume that the elastic limit of a crystalline solid is time independent. Recent experiments using the nanoindentation technique, however, reveal that the elastic limit of submicron-sized metallic volumes decreases as time under load increases. A submicron metallic volume can sustain a static load in the elastic regime initially, but transition to plastic deformation may occur after some waiting time. In this paper, the characteristics of this type of delayed plasticity are reviewed. The available experimental data suggest that homogeneous nucleation of the plasticity events, which was frequently discussed in the recent literature, occurs only at sufficiently high loads within a narrow range. In a lower and broader load range, the nucleation of the plasticity events occurs at a history dependent rate, thus via a damage-accumulation mechanism not compatible with the homogeneous nucleation theory. A model based on the diffusion-controlled, subcritical growth of a Frank loop just underneath the indenter is proposed in this work to explain the history dependent nucleation of instability observed at lower loads. By fitting to the available nanoindentation data in Ni 3 Al, it is apparent that self-diffusion along the indenter-sample interface, rather than through the bulk, is likely to be the controlling factor for the growth of the Frank loop to a critical size to yield a dislocation avalanche.
Persistent Identifierhttp://hdl.handle.net/10722/75657
ISSN
2015 Impact Factor: 1.632
2015 SCImago Journal Rankings: 0.953
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, AHWen_HK
dc.contributor.authorWo, PCen_HK
dc.date.accessioned2010-09-06T07:13:18Z-
dc.date.available2010-09-06T07:13:18Z-
dc.date.issued2006en_HK
dc.identifier.citationPhilosophical Magazine, 2006, v. 86 n. 9, p. 1287-1304en_HK
dc.identifier.issn1478-6435en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75657-
dc.description.abstractContinuum constitutive relations used in the design of macro-sized components assume that the elastic limit of a crystalline solid is time independent. Recent experiments using the nanoindentation technique, however, reveal that the elastic limit of submicron-sized metallic volumes decreases as time under load increases. A submicron metallic volume can sustain a static load in the elastic regime initially, but transition to plastic deformation may occur after some waiting time. In this paper, the characteristics of this type of delayed plasticity are reviewed. The available experimental data suggest that homogeneous nucleation of the plasticity events, which was frequently discussed in the recent literature, occurs only at sufficiently high loads within a narrow range. In a lower and broader load range, the nucleation of the plasticity events occurs at a history dependent rate, thus via a damage-accumulation mechanism not compatible with the homogeneous nucleation theory. A model based on the diffusion-controlled, subcritical growth of a Frank loop just underneath the indenter is proposed in this work to explain the history dependent nucleation of instability observed at lower loads. By fitting to the available nanoindentation data in Ni 3 Al, it is apparent that self-diffusion along the indenter-sample interface, rather than through the bulk, is likely to be the controlling factor for the growth of the Frank loop to a critical size to yield a dislocation avalanche.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.titleDelayed plasticity in nanoindentation of annealed crystalsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1478-6435&volume=86&spage=1287&epage=1304&date=2006&atitle=Delayed+plasticity+in+nanoindentation+of+annealed+crystalsen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1080/14786430500363130en_HK
dc.identifier.scopuseid_2-s2.0-33644997370en_HK
dc.identifier.hkuros116417en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33644997370&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume86en_HK
dc.identifier.issue9en_HK
dc.identifier.spage1287en_HK
dc.identifier.epage1304en_HK
dc.identifier.isiWOS:000235958200010-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.scopusauthoridWo, PC=9433530200en_HK
dc.identifier.citeulike551439-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats