Surface effects and the size-dependent hardening and strengthening of nickel micropillars

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dc.contributor.authorHurtado, Daniel E.
dc.contributor.authorOrtiz, Michael
dc.date.accessioned2024-01-10T12:43:12Z
dc.date.available2024-01-10T12:43:12Z
dc.date.issued2012
dc.description.abstractWe evaluate the extent to which two mechanisms contribute to the observed size effect of the ultimate yield strength of micropillars of diameters in the range of 1-30 mu m: dislocation pile-ups, modeled by means of a physically based non-local single-crystal plasticity model; and the short-range interaction of dislocations with the free surface of the micropillars, e.g., through the formation of surface steps. To this end, we formulate a crystal-plasticity model that accounts for the self-energy of geometrically necessary dislocations and the formation energy of dislocation steps at the boundary of the solid. These two additional sources of energy have the effect of rendering the internal energy of the solid non-local, thereby introducing the possibility of size effects. By way of validation of the model, we simulate the uniaxial compression tests on [269] nickel micropillars of Dimiduk et al. (2005). The calculated dependence of the ultimate strength of the micropillars exhibits strong power-law behavior, and is in good agreement with observation. Our analysis suggests that non-local hardening due to the self-energy of geometrically necessary dislocations does not suffice to account for the observed size effect of the ultimate yield strength of micropillars, and that surface effects, such as resulting from the formation energy of dislocation steps, contribute significantly to that size effect. (C) 2012 Elsevier Ltd. All rights reserved.
dc.description.funderUS Department of Energy National Nuclear Security Administration through Caltech's PSAAP Center for the Predictive Modeling and Simulation of High-Energy Density Dynamic Response of Materials
dc.description.funderConicyt Chile
dc.fechaingreso.objetodigital27-03-2024
dc.format.extent15 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jmps.2012.04.009
dc.identifier.eissn1873-4782
dc.identifier.issn0022-5096
dc.identifier.urihttps://doi.org/10.1016/j.jmps.2012.04.009
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77575
dc.identifier.wosidWOS:000305729300004
dc.information.autorucIngeniería;Hurtado D;S/I;3569
dc.issue.numero8
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final1446
dc.pagina.inicio1432
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.revistaJOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
dc.rightsacceso restringido
dc.subjectMultiscale material modeling
dc.subjectStrain-gradient plasticity
dc.subjectDislocations
dc.subjectSize effects
dc.subjectMicropillars
dc.subjectSTRAIN GRADIENT PLASTICITY
dc.subjectSUBGRAIN-DISLOCATION-STRUCTURES
dc.subjectORIENTED SINGLE-CRYSTALS
dc.subjectFINITE-ELEMENT METHOD
dc.subjectDISCRETE DISLOCATION
dc.subjectNANOCRYSTALLINE METALS
dc.subjectIRREVERSIBLE-PROCESSES
dc.subjectMECHANICAL-PROPERTIES
dc.subjectRECIPROCAL RELATIONS
dc.subjectMICRON SCALE
dc.titleSurface effects and the size-dependent hardening and strengthening of nickel micropillars
dc.typeartículo
dc.volumen60
sipa.codpersvinculados3569
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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