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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]  in Acta 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

Simulation of stress concentration in Mg alloys using the crystal plasticity finite element method / S.-H. Choi in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 320–329 Titre : Simulation of stress concentration in Mg alloys using the crystal plasticity finite element method Type de document : texte imprimé Auteurs : S.-H. Choi, Auteur ; D.H. Kim, Auteur ; S.-S. Park, Auteur Année de publication : 2010 Article en page(s) : pp. 320–329 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Crystal  plasticity  Finite  element  Stress  concentration  Texture  Twinning Résumé : A crystal plasticity finite element method (CPFEM), considering both crystallographic slip and deformation twinning, was developed to simulate the spatial stress concentration in AZ31 Mg alloys during in-plane compression. A predominant twin reorientation (PTR) model was successfully implemented to capture grain reorientation due to deformation twinning in twin-dominated deformation. By using the direct mapping technique for electron backscatter diffraction (EBSD) data, CPFEM can capture the heterogeneity of stress concentration at the grain boundaries in AZ31 Mg alloys during in-plane compression. The model demonstrated that deformation twinning enhances the local stress concentration at the grain boundaries between untwinned and twinned grains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006065 [article] Simulation of stress concentration in Mg alloys using the crystal plasticity finite element method [texte imprimé] / S.-H. Choi, Auteur ; D.H. Kim, Auteur ; S.-S. Park, Auteur . - 2010 . - pp. 320–329. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 320–329 Mots-clés : Crystal  plasticity  Finite  element  Stress  concentration  Texture  Twinning Résumé : A crystal plasticity finite element method (CPFEM), considering both crystallographic slip and deformation twinning, was developed to simulate the spatial stress concentration in AZ31 Mg alloys during in-plane compression. A predominant twin reorientation (PTR) model was successfully implemented to capture grain reorientation due to deformation twinning in twin-dominated deformation. By using the direct mapping technique for electron backscatter diffraction (EBSD) data, CPFEM can capture the heterogeneity of stress concentration at the grain boundaries in AZ31 Mg alloys during in-plane compression. The model demonstrated that deformation twinning enhances the local stress concentration at the grain boundaries between untwinned and twinned grains. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006065