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Article: Effects of trapping dislocations within small crystals on their deformation behavior

TitleEffects of trapping dislocations within small crystals on their deformation behavior
Authors
KeywordsComposites
Compression test
Dislocations
Nanoindentation
Plastic deformation
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2009, v. 57 n. 16, p. 4902-4910 How to Cite?
AbstractMicron-sized metallic crystals are much stronger than their bulk counterparts. However, their deformation is jerky and they do not strain harden continuously, so that precise metal forming is difficult. This work demonstrates that coating or filling aluminum microcolumns with tungsten can eliminate these strain bursts and significantly increase the strain-hardening rate. A rule-of-mixtures analysis indicates that such improvements in the mechanical behavior of the composite micropillars are not due to the load-sharing effect of the incorporated tungsten phase. Transmission electron microscopy examination reveals that the coating or filling traps dislocations inside the crystals, thus raising the stored dislocation density by up to three orders of magnitude. This study indicates that microcrystals can be significantly strain-hardened and their deformation behavior can become more controllable when dislocations are confined inside them. © 2009 Acta Materialia Inc.
Persistent Identifierhttp://hdl.handle.net/10722/76013
ISSN
2015 Impact Factor: 5.058
2015 SCImago Journal Rankings: 3.683
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Special Administration Region, PR 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, PR China (Project No. HKU7156/08E).

References

 

DC FieldValueLanguage
dc.contributor.authorNg, KSen_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2010-09-06T07:16:46Z-
dc.date.available2010-09-06T07:16:46Z-
dc.date.issued2009en_HK
dc.identifier.citationActa Materialia, 2009, v. 57 n. 16, p. 4902-4910en_HK
dc.identifier.issn1359-6454en_HK
dc.identifier.urihttp://hdl.handle.net/10722/76013-
dc.description.abstractMicron-sized metallic crystals are much stronger than their bulk counterparts. However, their deformation is jerky and they do not strain harden continuously, so that precise metal forming is difficult. This work demonstrates that coating or filling aluminum microcolumns with tungsten can eliminate these strain bursts and significantly increase the strain-hardening rate. A rule-of-mixtures analysis indicates that such improvements in the mechanical behavior of the composite micropillars are not due to the load-sharing effect of the incorporated tungsten phase. Transmission electron microscopy examination reveals that the coating or filling traps dislocations inside the crystals, thus raising the stored dislocation density by up to three orders of magnitude. This study indicates that microcrystals can be significantly strain-hardened and their deformation behavior can become more controllable when dislocations are confined inside them. © 2009 Acta Materialia Inc.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamaten_HK
dc.relation.ispartofActa Materialiaen_HK
dc.subjectCompositesen_HK
dc.subjectCompression testen_HK
dc.subjectDislocationsen_HK
dc.subjectNanoindentationen_HK
dc.subjectPlastic deformationen_HK
dc.titleEffects of trapping dislocations within small crystals on their deformation behavioren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1359-6454&volume=57&issue=16&spage=4902&epage=4910&date=2009&atitle=Effect+of+trapping+dislocations+within+small+crystals+on+their+deformation+behavioren_HK
dc.identifier.emailNgan, AHW:hwngan@hkucc.hku.hken_HK
dc.identifier.authorityNgan, AHW=rp00225en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.actamat.2009.06.053en_HK
dc.identifier.scopuseid_2-s2.0-68949128993en_HK
dc.identifier.hkuros170081en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-68949128993&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume57en_HK
dc.identifier.issue16en_HK
dc.identifier.spage4902en_HK
dc.identifier.epage4910en_HK
dc.identifier.eissn1873-2453-
dc.identifier.isiWOS:000270163900028-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNg, KS=23005417800en_HK
dc.identifier.scopusauthoridNgan, AHW=7006827202en_HK
dc.identifier.citeulike5332264-

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