Deformation processes in View the MathML source-textured nanocrystalline Mg by molecular dynamics simulation / D.H. Kim in Acta materialia, Vol. 58 N° 19 (Novembre 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6217–6229 Titre : Deformation processes in View the MathML source-textured nanocrystalline Mg by molecular dynamics simulation Type de document : texte imprimé Auteurs : D.H. Kim, Auteur ; M.V. Manuel, Auteur ; F. Ebrahimi, Auteur Année de publication : 2011 Article en page(s) : pp. 6217–6229 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Magnesium Nanocrystalline Plastic deformation Molecular dynamics Résumé : Plastic deformation of nanocrystalline Mg is studied using molecular dynamics simulation. In a View the MathML source-textured structure, slip and twinning behaviors are observed during tensile loading. Various twinning and slip process are identified, with basal slip and tensile View the MathML source twinning being dominant. For grain sizes larger than ∼30 nm, basal slip occurs at a lower strain than twinning; for smaller grain sizes, twinning takes place at a lower strain than slip. For small grain sizes, the system generates partial dislocations; extended or full type dislocations are generated at high stress and large grain sizes. As the external stress increases, pyramidal 〈c + a〉 dislocations are also frequently generated, leading to a reduction in twinning activity. Whereas, under low stresses only the tensile twin is created at the grain boundaries, under high stress compressive twins are created at grain boundaries and in the interior of grains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410004805 [article] Deformation processes in View the MathML source-textured nanocrystalline Mg by molecular dynamics simulation [texte imprimé] / D.H. Kim, Auteur ; M.V. Manuel, Auteur ; F. Ebrahimi, Auteur . - 2011 . - pp. 6217–6229. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6217–6229 Mots-clés : Magnesium Nanocrystalline Plastic deformation Molecular dynamics Résumé : Plastic deformation of nanocrystalline Mg is studied using molecular dynamics simulation. In a View the MathML source-textured structure, slip and twinning behaviors are observed during tensile loading. Various twinning and slip process are identified, with basal slip and tensile View the MathML source twinning being dominant. For grain sizes larger than ∼30 nm, basal slip occurs at a lower strain than twinning; for smaller grain sizes, twinning takes place at a lower strain than slip. For small grain sizes, the system generates partial dislocations; extended or full type dislocations are generated at high stress and large grain sizes. As the external stress increases, pyramidal 〈c + a〉 dislocations are also frequently generated, leading to a reduction in twinning activity. Whereas, under low stresses only the tensile twin is created at the grain boundaries, under high stress compressive twins are created at grain boundaries and in the interior of grains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410004805

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