Documents disponibles écrits par cet auteur

Detwinning mechanisms for growth twins in face-centered cubic metals / J. Wang in Acta materialia, Vol. 58 N° 6 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2262–2270 Titre : Detwinning mechanisms for growth twins in face-centered cubic metals Type de document : texte imprimé Auteurs : J. Wang, Auteur ; N. Li, Auteur ; O. Anderoglu, Auteur Année de publication : 2011 Article en page(s) : pp. 2262–2270 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nanotwins  Detwinning  In  situ  TEM  Atomistic  simulations Résumé : Using in situ transmission electron microscopy, we studied the stability of growth twins. We observed the rapid migration of incoherent twin boundaries (ITBs), indicating that nanotwins are unstable. Topological analysis and atomistic simulations are adopted to explore detwinning mechanisms. The results show that: (i) the detwinning process is accomplished via the collective glide of multiple twinning dislocations that form an ITB; (ii) detwinning can easily occur for thin twins, and the driving force is mainly attributed to a variation of the excess energy of a coherent twin boundary; (iii) shear stresses enable ITBs to migrate easily, causing the motion of coherent twin boundaries; and (iv) the migration velocity depends on stacking fault energy. The results imply that detwinning becomes the dominant deformation mechanism for growth twins of the order of a few nanometers thick. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008556 [article] Detwinning mechanisms for growth twins in face-centered cubic metals [texte imprimé] / J. Wang, Auteur ; N. Li, Auteur ; O. Anderoglu, Auteur . - 2011 . - pp. 2262–2270. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2262–2270 Mots-clés : Nanotwins  Detwinning  In  situ  TEM  Atomistic  simulations Résumé : Using in situ transmission electron microscopy, we studied the stability of growth twins. We observed the rapid migration of incoherent twin boundaries (ITBs), indicating that nanotwins are unstable. Topological analysis and atomistic simulations are adopted to explore detwinning mechanisms. The results show that: (i) the detwinning process is accomplished via the collective glide of multiple twinning dislocations that form an ITB; (ii) detwinning can easily occur for thin twins, and the driving force is mainly attributed to a variation of the excess energy of a coherent twin boundary; (iii) shear stresses enable ITBs to migrate easily, causing the motion of coherent twin boundaries; and (iv) the migration velocity depends on stacking fault energy. The results imply that detwinning becomes the dominant deformation mechanism for growth twins of the order of a few nanometers thick. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008556