Nanotwinned fcc metals: Strengthening versus softening mechanisms

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dc.contributorVirginia Techen
dc.contributor.authorStukowski, A.en
dc.contributor.authorAlbe, K.en
dc.contributor.authorFarkas, Dianaen
dc.contributor.departmentMaterials Science and Engineering (MSE)en
dc.date.accessed2014-04-23en
dc.date.accessioned2014-05-07T15:37:02Zen
dc.date.available2014-05-07T15:37:02Zen
dc.date.issued2010-12-01en
dc.description.abstractThe strengthening effect of twins in nanocrystalline metals has been reported both in experiment and simulation. While twins are mostly considered as effective barriers to dislocation slip transfer, they can also provide nucleation sites for dislocations or migrate during the deformation process, thereby contributing to plasticity. By comparing twinned and nontwinned samples, we study the effect of twins on the deformation behavior of nanocrystalline Cu and Pd using atomistic simulations. While Cu shows hardening due to the presence of twins, Pd shows the opposite effect. A quantitative dislocation analysis method is applied, which allows to analyze dislocation interactions with twin planes and grain boundaries and to measure dislocation, stacking fault, and twin-boundary densities as functions of strain. A statistical analysis of the occurring dislocation types provides direct evidence for the role of twin boundaries as effective sources for twinning dislocations, which are the reason for the observed softening in some fcc materials. In addition, we discuss how the orientation of the loading direction with respect to the twin planes affects the response of nanotwinned Cu and Pd.en
dc.description.sponsorshipDeutsche Forschungsgemeinschaft FOR714en
dc.description.sponsorshipForschungszentrum Julichen
dc.description.sponsorshipbwGRiDen
dc.description.sponsorshipDOE, Basic Energy Sciencesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationStukowski, A.; Albe, K.; Farkas, D., "Nanotwinned fcc metals: Strengthening versus softening mechanisms," Phys. Rev. B 82, 224103 DOI: http://dx.doi.org/10.1103/PhysRevB.82.224103en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.82.224103en
dc.identifier.issn1098-0121en
dc.identifier.urihttp://hdl.handle.net/10919/47865en
dc.identifier.urlhttp://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.224103en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectCoherent twin boundariesen
dc.subjectCentered-cubic metalsen
dc.subjectMolecular dynamicsen
dc.subjectUltrahigh strengthen
dc.subjectMaximum strengthen
dc.subjectRate sensitivityen
dc.subjectCopperen
dc.subjectDeformationen
dc.subjectNanoscaleen
dc.subjectDuctilityen
dc.subjectPhysicsen
dc.subjectCondensed matteren
dc.titleNanotwinned fcc metals: Strengthening versus softening mechanismsen
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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