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Article: Atomistic simulation studies on deformation mechanism of nanocrystalline cobalt
Title | Atomistic simulation studies on deformation mechanism of nanocrystalline cobalt |
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Authors | |
Keywords | Nanocrystalline cobalt Molecular dynamics simulation Deformation mechanism Twinning hcp metals |
Issue Date | 2005 |
Publisher | Pergamon. 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? |
Abstract | An 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 Identifier | http://hdl.handle.net/10722/209753 |
ISSN | 2023 Impact Factor: 8.3 2023 SCImago Journal Rankings: 2.916 |
DC Field | Value | Language |
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dc.contributor.author | Zheng, GP | - |
dc.contributor.author | Wang, YM | - |
dc.contributor.author | Li, M | - |
dc.date.accessioned | 2015-05-15T06:58:02Z | - |
dc.date.available | 2015-05-15T06:58:02Z | - |
dc.date.issued | 2005 | - |
dc.identifier.citation | Acta Materialia, 2005, v. 53 n. 14, p. 3893-3901 | - |
dc.identifier.issn | 1359-6454 | - |
dc.identifier.uri | http://hdl.handle.net/10722/209753 | - |
dc.description.abstract | An 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.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat | - |
dc.relation.ispartof | Acta Materialia | - |
dc.rights | NOTICE: 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.subject | Nanocrystalline cobalt | - |
dc.subject | Molecular dynamics simulation | - |
dc.subject | Deformation mechanism | - |
dc.subject | Twinning | - |
dc.subject | hcp metals | - |
dc.title | Atomistic simulation studies on deformation mechanism of nanocrystalline cobalt | - |
dc.type | Article | - |
dc.identifier.email | Zheng, GP: gezheng@hotmail.com | - |
dc.identifier.authority | Zheng, GP=rp01279 | - |
dc.identifier.hkuros | 101489 | - |
dc.identifier.volume | 53 | - |
dc.identifier.issue | 14 | - |
dc.identifier.spage | 3893 | - |
dc.identifier.epage | 3901 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 1359-6454 | - |