Orientation dependence of shock-induced twinning and substructures in a copper bicrystal / Fang Cao in Acta materialia, Vol. 58 N° 2 (Janvier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 549-559 Titre : Orientation dependence of shock-induced twinning and substructures in a copper bicrystal Type de document : texte imprimé Auteurs : Fang Cao, Auteur ; Irene J. Beyerlein, Auteur ; Francis L. Addessio, Auteur Article en page(s) : pp. 549-559 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Copper Shock recovery Deformation structure Twinning Dislocation Index. décimale : 669 Métallurgie Résumé : Shock recovery experiments have been conducted to assess the role of shock stress and orientation dependence on substructure evolution and deformation twinning of a [1 0 0]/View the MathML source copper bicrystal. Transmission electron microscopy of the post-shock specimens revealed that well-defined dislocation cell structures developed in both grains and the average cell size decreased with increasing shock pressure from 5 to 10 GPa. Twinning occurred in the [1 0 0] grain, but not the View the MathML source grain, at the 10 GPa shock pressure. The stress and orientation dependence of incipient twinning can be predicted by the stress and orientation conditions required to dissociate slip dislocations into glissile twinning dislocations. The dynamic widths between the two partials are calculated considering the three-dimensional deviatoric stress state induced by the shock as calculated using plane-strain plate impact simulations and the relativistic and drag effects on dislocations moving at high speeds. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Orientation dependence of shock-induced twinning and substructures in a copper bicrystal [texte imprimé] / Fang Cao, Auteur ; Irene J. Beyerlein, Auteur ; Francis L. Addessio, Auteur . - pp. 549-559. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 549-559 Mots-clés : Copper Shock recovery Deformation structure Twinning Dislocation Index. décimale : 669 Métallurgie Résumé : Shock recovery experiments have been conducted to assess the role of shock stress and orientation dependence on substructure evolution and deformation twinning of a [1 0 0]/View the MathML source copper bicrystal. Transmission electron microscopy of the post-shock specimens revealed that well-defined dislocation cell structures developed in both grains and the average cell size decreased with increasing shock pressure from 5 to 10 GPa. Twinning occurred in the [1 0 0] grain, but not the View the MathML source grain, at the 10 GPa shock pressure. The stress and orientation dependence of incipient twinning can be predicted by the stress and orientation conditions required to dissociate slip dislocations into glissile twinning dislocations. The dynamic widths between the two partials are calculated considering the three-dimensional deviatoric stress state induced by the shock as calculated using plane-strain plate impact simulations and the relativistic and drag effects on dislocations moving at high speeds. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

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