Strain-induced grain growth and rotation in nickel nanowires

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dc.contributorVirginia Techen
dc.contributor.authorMonk, J.en
dc.contributor.authorFarkas, Dianaen
dc.contributor.departmentMaterials Science and Engineering (MSE)en
dc.date.accessed2013-12-18en
dc.date.accessioned2014-02-11T13:46:03Zen
dc.date.available2014-02-11T13:46:03Zen
dc.date.issued2007-01-10en
dc.description.abstractVirtual tensile tests of nanocrystalline nickel wires of initial 5 nm grain size were simulated at strain rates varying from 3x10(7) s(-1) to 1x10(9) s(-1) at 300 K, reaching deformation levels up to 36%. The virtual tensile tests allowed the study of the strain rate sensitivity of these nanowires, yielding an activation volume of similar to 2b(3), where b is the Burger's vector, consistent with grain boundary mechanisms of plasticity. Most importantly, after 3% deformation the grain size increased significantly during the deformation, with larger grains growing at the expense of the smaller ones as the deformation levels increase. The volume of each grain was monitored as a function of time and stress level. The results clearly indicate that the observed grain growth is stress driven, with grain size versus stress behavior being only weakly dependent on the strain rate and simulation time. Grain growth is also accompanied by grain rotation. The observations are interpreted in terms of the coupling of the relative motion of the grains parallel to the boundary and the motion of the boundary in the direction perpendicular to itself. Our results are consistent with a model where the deformation is accommodated by grain boundary sliding which in turn is coupled with grain boundary migration and rotation, producing grain growth.en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMonk, Joshua ; Farkas, Diana, Jan 2007. "Strain-induced grain growth and rotation in nickel nanowires," PHYSICAL REVIEW B 75(4): 045414. DOI: 10.1103/PhysRevB.75.045414en
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.75.045414en
dc.identifier.issn1098-0121en
dc.identifier.urihttp://hdl.handle.net/10919/25417en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevB.75.045414en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectMolecular-dynamics simulationsen
dc.subjectNanocrystalline metalsen
dc.subjectPlastic-deformationen
dc.subjectRate sensitivityen
dc.subjectBoundaryen
dc.subjectCopperen
dc.subjectStressen
dc.subjectTemperatureen
dc.subjectIndentationen
dc.subjectMechanismsen
dc.subjectPhysicsen
dc.titleStrain-induced grain growth and rotation in nickel nanowiresen
dc.title.serialPhysical Review Ben
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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