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Article: Atomistic simulation studies on deformation mechanism of nanocrystalline cobalt

TitleAtomistic simulation studies on deformation mechanism of nanocrystalline cobalt
Authors
KeywordsNanocrystalline cobalt
Molecular dynamics simulation
Deformation mechanism
Twinning
hcp metals
Issue Date2005
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2005, v. 53 n. 14, p. 3893-3901 How to Cite?
AbstractAn approach is developed to investigate the deformation behavior of hexagonal close-packed (hcp) nanocrystalline (nc) cobalt by computer simulations. The microstructures are modeled by a grain growth theory, and the mechanical deformation behavior is investigated using molecular dynamics simulation in nc-cobalt samples with an average grain size of 10 nm. The deformation mechanisms are found to involve both full and partial dislocation activities. Despite the small stacking fault energy of nc-cobalt, surprisingly the deformation twinning is not prevalent in the model cobalt sample. The simulation suggests that unlike the easy twinning events in coarse-grained hcp metals, deformation of nanocrystalline cobalt is primarily controlled by partial dislocation slips and stacking faults. The continuous accumulation of deformation faults eventually leads to hcp to face-centred cubic allotropic phase transformation during tension and compression of nc-cobalt.
Persistent Identifierhttp://hdl.handle.net/10722/209753
ISSN
2015 Impact Factor: 5.058
2015 SCImago Journal Rankings: 3.683

 

DC FieldValueLanguage
dc.contributor.authorZheng, GP-
dc.contributor.authorWang, YM-
dc.contributor.authorLi, M-
dc.date.accessioned2015-05-15T06:58:02Z-
dc.date.available2015-05-15T06:58:02Z-
dc.date.issued2005-
dc.identifier.citationActa Materialia, 2005, v. 53 n. 14, p. 3893-3901-
dc.identifier.issn1359-6454-
dc.identifier.urihttp://hdl.handle.net/10722/209753-
dc.description.abstractAn approach is developed to investigate the deformation behavior of hexagonal close-packed (hcp) nanocrystalline (nc) cobalt by computer simulations. The microstructures are modeled by a grain growth theory, and the mechanical deformation behavior is investigated using molecular dynamics simulation in nc-cobalt samples with an average grain size of 10 nm. The deformation mechanisms are found to involve both full and partial dislocation activities. Despite the small stacking fault energy of nc-cobalt, surprisingly the deformation twinning is not prevalent in the model cobalt sample. The simulation suggests that unlike the easy twinning events in coarse-grained hcp metals, deformation of nanocrystalline cobalt is primarily controlled by partial dislocation slips and stacking faults. The continuous accumulation of deformation faults eventually leads to hcp to face-centred cubic allotropic phase transformation during tension and compression of nc-cobalt.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat-
dc.relation.ispartofActa Materialia-
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in [Journal title]. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in PUBLICATION, [VOL#, ISSUE#, (DATE)] DOI# -
dc.subjectNanocrystalline cobalt-
dc.subjectMolecular dynamics simulation-
dc.subjectDeformation mechanism-
dc.subjectTwinning-
dc.subjecthcp metals-
dc.titleAtomistic simulation studies on deformation mechanism of nanocrystalline cobalt-
dc.typeArticle-
dc.identifier.emailZheng, GP: gezheng@hotmail.com-
dc.identifier.authorityZheng, GP=rp01279-
dc.identifier.hkuros101489-
dc.identifier.volume53-
dc.identifier.issue14-
dc.identifier.spage3893-
dc.identifier.epage3901-
dc.publisher.placeUnited Kingdom-

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