Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation / M.J. Demkowicz in Acta materialia, Vol. 59 N° 20 (Décembre 2011)  

Public ISBD [article]  inActa materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7744–7756 Titre : Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation Type de document : texte imprimé Auteurs : M.J. Demkowicz, Auteur ; L. Thilly, Auteur Année de publication : 2012 Article en page(s) : pp. 7744–7756 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Severe plastic deformation Nanocomposite Interface structure Slip Molecular dynamics Résumé : Atomistic modeling is used to investigate the shear resistance and interaction with point defects of a Cu–Nb interface found in nanocomposites synthesized by severe plastic deformation. The shear resistance of this interface is highly anisotropic: in one direction shearing occurs at stresses <1200 MPa, while in the other it does not occur at all. The binding energy of vacancies, interstitials and He impurities to this interface depends sensitively on the binding location, but there is no point defect delocalization, nor does this interface contain any constitutional defects. These behaviors are markedly dissimilar from a different Cu–Nb interface found in magnetron sputtered composites. The dissimilarities may, however, be explained by quantitative differences in the detailed structure of these two interfaces. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006318 [article] Structure, shear resistance and interaction with point defects of interfaces in Cu–Nb nanocomposites synthesized by severe plastic deformation [texte imprimé] / M.J. Demkowicz, Auteur ; L. Thilly, Auteur . - 2012 . - pp. 7744–7756. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7744–7756 Mots-clés : Severe plastic deformation Nanocomposite Interface structure Slip Molecular dynamics Résumé : Atomistic modeling is used to investigate the shear resistance and interaction with point defects of a Cu–Nb interface found in nanocomposites synthesized by severe plastic deformation. The shear resistance of this interface is highly anisotropic: in one direction shearing occurs at stresses <1200 MPa, while in the other it does not occur at all. The binding energy of vacancies, interstitials and He impurities to this interface depends sensitively on the binding location, but there is no point defect delocalization, nor does this interface contain any constitutional defects. These behaviors are markedly dissimilar from a different Cu–Nb interface found in magnetron sputtered composites. The dissimilarities may, however, be explained by quantitative differences in the detailed structure of these two interfaces. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006318

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