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Effects of Schmid factor and slip nucleation on deformation mechanism in columnar-grained nanotwinned Ag and Cu

TitleEffects of Schmid factor and slip nucleation on deformation mechanism in columnar-grained nanotwinned Ag and Cu
Publication TypeJournal Article
Year of Publication2015
AuthorsBorovikov, V, Mendelev, MI, King, AH, LeSar, R
JournalJournal of Applied Physics
Volume117
Pagination085302
Date Published02
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000351132500060
Keywordsboundaries, copper, ductility, fcc metals, maximum strength, molecular-dynamics simulation, nanoscale twins, rate sensitivity, stress, ultrahigh-strength
Abstract

We report the results of a molecular dynamics study of the effect of texture on the yield and peak stresses in columnar-grained nanotwinned Ag and Cu. The simulations suggest that in pure nanotwinned face-centered cubic metals, the strength is determined primarily by the cooperation or competition between two major factors: the magnitude of the Schmid factors for the available slip systems and the effectiveness of grain boundaries (and their triple-junctions) in generating dislocations. These factors and their relative impact depend on the geometry of the specimen relative to the applied stress, which is typically reflected in the texture of the material in experimental studies. The detailed mechanisms of plastic deformation are discussed for seven specific geometries that represent a range of different textures. (C) 2015 AIP Publishing LLC.

DOI10.1063/1.4913381
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