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Article: Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3Al

TitleSize dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3Al
Authors
KeywordsCrystalline Materials
Dislocation
Incipient Plasticity
Molecular Dynamics
Nanoindentation
Yield Strength
Issue Date2006
PublisherThe Royal Society. The Journal's web site is located at http://www.pubs.royalsoc.ac.uk/index.cfm?page=1086
Citation
Proceedings of the Royal Society of London A, 2006, v. 462 n. 2070, p. 1661-1681 How to Cite?
AbstractRecent experiments indicate that the first yield point of micron-sized metals exhibits significant statistical scatter as well as strong dependence on the specimen size. In this work, molecular dynamics (MD) simulations are carried out to investigate the onset of shear deformation in a small block of material, using an embedded atom potential for the intermetallic Ni3Al alloy. Incipient plasticity in the form of homogeneous dislocation generation is observed to occur at atomic sites with interatomic displacements approaching one-half of the Shockley partial Burgers vector. From the distribution function of the interatomic displacements observed in the MD simulations, the probability of a general material volume surviving under given loading conditions is predicted. The survival probability is then calculated for several situations, including homogeneous deformation and nanoindentation, to predict the critical load for incipient plasticity to occur in these situations. The predicted results are compared to micro-pillar compression and nanoindentation experiments on Ni3Al available in the literature. © 2006 The Royal Society.
Persistent Identifierhttp://hdl.handle.net/10722/156839
ISSN
2015 Impact Factor: 1.935
2015 SCImago Journal Rankings: 0.894
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, AHWen_US
dc.contributor.authorZuo, Len_US
dc.contributor.authorWo, PCen_US
dc.date.accessioned2012-08-08T08:44:11Z-
dc.date.available2012-08-08T08:44:11Z-
dc.date.issued2006en_US
dc.identifier.citationProceedings of the Royal Society of London A, 2006, v. 462 n. 2070, p. 1661-1681en_US
dc.identifier.issn1364-5021en_US
dc.identifier.urihttp://hdl.handle.net/10722/156839-
dc.description.abstractRecent experiments indicate that the first yield point of micron-sized metals exhibits significant statistical scatter as well as strong dependence on the specimen size. In this work, molecular dynamics (MD) simulations are carried out to investigate the onset of shear deformation in a small block of material, using an embedded atom potential for the intermetallic Ni3Al alloy. Incipient plasticity in the form of homogeneous dislocation generation is observed to occur at atomic sites with interatomic displacements approaching one-half of the Shockley partial Burgers vector. From the distribution function of the interatomic displacements observed in the MD simulations, the probability of a general material volume surviving under given loading conditions is predicted. The survival probability is then calculated for several situations, including homogeneous deformation and nanoindentation, to predict the critical load for incipient plasticity to occur in these situations. The predicted results are compared to micro-pillar compression and nanoindentation experiments on Ni3Al available in the literature. © 2006 The Royal Society.en_US
dc.languageengen_US
dc.publisherThe Royal Society. The Journal's web site is located at http://www.pubs.royalsoc.ac.uk/index.cfm?page=1086en_US
dc.relation.ispartofProceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciencesen_US
dc.subjectCrystalline Materialsen_US
dc.subjectDislocationen_US
dc.subjectIncipient Plasticityen_US
dc.subjectMolecular Dynamicsen_US
dc.subjectNanoindentationen_US
dc.subjectYield Strengthen_US
dc.titleSize dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3Alen_US
dc.typeArticleen_US
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hken_US
dc.identifier.authorityNgan, AHW=rp00225en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1098/rspa.2005.1645en_US
dc.identifier.scopuseid_2-s2.0-33746585418en_US
dc.identifier.hkuros116355-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33746585418&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume462en_US
dc.identifier.issue2070en_US
dc.identifier.spage1661en_US
dc.identifier.epage1681en_US
dc.identifier.isiWOS:000237561300003-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridNgan, AHW=7006827202en_US
dc.identifier.scopusauthoridZuo, L=36863503700en_US
dc.identifier.scopusauthoridWo, PC=9433530200en_US
dc.identifier.citeulike572369-

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