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Article: Deformation of micron-sized aluminium bi-crystal pillars

TitleDeformation of micron-sized aluminium bi-crystal pillars
Authors
KeywordsAluminium
Bi-crystal
Deformation
Dislocation interactions
Dislocation mechanics
Dislocations
Ion beams
Micro-crystals
Nanoindentation
Nanomechanics
Issue Date2009
PublisherTaylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14786435.asp
Citation
Philosophical Magazine, 2009, v. 89 n. 33, p. 3013-3026 How to Cite?
AbstractThe deformation of micron-sized single-crystals is jumpy and stochastic, and this may pose potential formability and reliability problems if components for future micro-machines are to be made from small metal volumes. In this work, micron-sized bi-crystal pillars were fabricated by focussed ion-beam milling from grain-boundary regions in coarse-grained polycrystalline aluminium. Each bi-crystal pillar contained a grain boundary intersecting its top surface, and was subjected to compression using a flat-ended nanoindenter tip. Their deformation was found to have smaller strain bursts, fewer periods of strain hardening at elastic-like rates, as well as greater work-hardening rate and flow stress, than single-crystal pillars of similar sizes. Transmission electron microscopy revealed severe dislocation accumulation in the deformed bi-crystal pillars, whereas the residual dislocation density remained low in single-crystal micro-pillars of similar dimensions after deformation to comparable strains. The results suggest that a grain boundary inside a micro-specimen can trap dislocations inside the specimen, leading to a significant rise in the strain-hardening rate as well as to smoother deformation.
Persistent Identifierhttp://hdl.handle.net/10722/75945
ISSN
2015 Impact Factor: 1.632
2015 SCImago Journal Rankings: 0.953
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administration Region, P.R. ChinaHKU7156/08E
Funding Information:

We thank the Electron Microscope Unit of HKU for their assistance. The work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administration Region, P.R. China (Project No. HKU7156/08E).

References

 

DC FieldValueLanguage
dc.contributor.authorNg, KSen_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2010-09-06T07:16:06Z-
dc.date.available2010-09-06T07:16:06Z-
dc.date.issued2009en_HK
dc.identifier.citationPhilosophical Magazine, 2009, v. 89 n. 33, p. 3013-3026en_HK
dc.identifier.issn1478-6435en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75945-
dc.description.abstractThe deformation of micron-sized single-crystals is jumpy and stochastic, and this may pose potential formability and reliability problems if components for future micro-machines are to be made from small metal volumes. In this work, micron-sized bi-crystal pillars were fabricated by focussed ion-beam milling from grain-boundary regions in coarse-grained polycrystalline aluminium. Each bi-crystal pillar contained a grain boundary intersecting its top surface, and was subjected to compression using a flat-ended nanoindenter tip. Their deformation was found to have smaller strain bursts, fewer periods of strain hardening at elastic-like rates, as well as greater work-hardening rate and flow stress, than single-crystal pillars of similar sizes. Transmission electron microscopy revealed severe dislocation accumulation in the deformed bi-crystal pillars, whereas the residual dislocation density remained low in single-crystal micro-pillars of similar dimensions after deformation to comparable strains. The results suggest that a grain boundary inside a micro-specimen can trap dislocations inside the specimen, leading to a significant rise in the strain-hardening rate as well as to smoother deformation.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.subjectAluminiumen_HK
dc.subjectBi-crystalen_HK
dc.subjectDeformationen_HK
dc.subjectDislocation interactionsen_HK
dc.subjectDislocation mechanicsen_HK
dc.subjectDislocationsen_HK
dc.subjectIon beamsen_HK
dc.subjectMicro-crystalsen_HK
dc.subjectNanoindentationen_HK
dc.subjectNanomechanicsen_HK
dc.titleDeformation of micron-sized aluminium bi-crystal pillarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1478-6435&volume=89&issue=33&spage=3013&epage=3026&date=2009&atitle=Deformation+of+micron-sized+aluminium+bi-crystal+pillarsen_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1080/14786430903164614en_HK
dc.identifier.scopuseid_2-s2.0-70449112907en_HK
dc.identifier.hkuros170080en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70449112907&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume89en_HK
dc.identifier.issue33en_HK
dc.identifier.spage3013en_HK
dc.identifier.epage3026en_HK
dc.identifier.isiWOS:000271872300002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNg, KS=23005417800en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK

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