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Simulations of the effect of surface coatings on plasticity at small scales

TitleSimulations of the effect of surface coatings on plasticity at small scales
Publication TypeJournal Article
Year of Publication2010
AuthorsZhou CZ, Biner S, LeSar R
Journal TitleScripta Materialia
Volume63
Pages1096-1099
Date Published11
ISBN Number1359-6462
Accession NumberISI:000282866700016
Keywordsbehavior, COMPRESSION, cross-slip, crystal plasticity, deformation, dislocation dynamics, FLOW, micro-pillars, micropillars, nickel microcrystals, parametric dislocation dynamics, plastic deformation, small scales, strength
Abstract

Three-dimensional dislocation dynamics simulations were employed to examine how hard coatings affect plastic deformation in micron- and submicron-sized, single-crystal pillars ("micropillars") of nickel. Cross-slip of dislocations in the coated samples was found to be necessary for the formation of banded structures and subcells. Our simulations thus offer an explanation for both the significant increases in compressive strength and the higher strain-hardening rate as well as formation of banded structures in coated micropillars. (C) 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
URL<Go to ISI>://000282866700016
DOI10.1016/J.Scriptamat.2010.08.012
Alternate JournalScripta Mater