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Interphase boundary structure and accommodation mechanism of lenticular martensite in Fe–Ni alloys / A. Shibata in Acta materialia, Vol. 58 N° 9 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3477–3492 Titre : Interphase boundary structure and accommodation mechanism of lenticular martensite in Fe–Ni alloys Type de document : texte imprimé Auteurs : A. Shibata, Auteur ; T. Furuhara, Auteur ; T. Maki, Auteur Année de publication : 2011 Article en page(s) : pp. 3477–3492 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Martensitic  transformation  Interface  structure  TEM  HREM  Lenticular  martensite Résumé : This study investigates the interphase boundary structures of lenticular martensites in Fe–33Ni and Fe–31Ni, and discusses the accommodation mechanism for transformation strain. Despite the large difference in the macroscopic morphology of the interphase boundary, the nature of interfacial dislocations in both alloys is almost the same; there are two sets of screw dislocations with a/2 [View the MathML source View the MathML source 1]M and a/2 [1 View the MathML source 1]M Burgers vectors on the interphase boundary. On the basis of the array of interfacial dislocations, the shear planes of dislocations with a/2 [View the MathML source View the MathML source 1]M and a/2 [1 View the MathML source 1]M Burgers vectors were determined to be (1 1 2)M (=(1 0 1)A) and (View the MathML source 1 2)M (=(0 1 1)A). Two sets of interfacial dislocations accommodate the atomistic misfit strain due to the change in the stacking sequence and the shape of parallel close packed planes. The macroscopic transformation strain and elastic strain energy of lenticular martensite are also reduced by the presence of the observed lattice invariant deformations. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001084 [article] Interphase boundary structure and accommodation mechanism of lenticular martensite in Fe–Ni alloys [texte imprimé] / A. Shibata, Auteur ; T. Furuhara, Auteur ; T. Maki, Auteur . - 2011 . - pp. 3477–3492. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3477–3492 Mots-clés : Martensitic  transformation  Interface  structure  TEM  HREM  Lenticular  martensite Résumé : This study investigates the interphase boundary structures of lenticular martensites in Fe–33Ni and Fe–31Ni, and discusses the accommodation mechanism for transformation strain. Despite the large difference in the macroscopic morphology of the interphase boundary, the nature of interfacial dislocations in both alloys is almost the same; there are two sets of screw dislocations with a/2 [View the MathML source View the MathML source 1]M and a/2 [1 View the MathML source 1]M Burgers vectors on the interphase boundary. On the basis of the array of interfacial dislocations, the shear planes of dislocations with a/2 [View the MathML source View the MathML source 1]M and a/2 [1 View the MathML source 1]M Burgers vectors were determined to be (1 1 2)M (=(1 0 1)A) and (View the MathML source 1 2)M (=(0 1 1)A). Two sets of interfacial dislocations accommodate the atomistic misfit strain due to the change in the stacking sequence and the shape of parallel close packed planes. The macroscopic transformation strain and elastic strain energy of lenticular martensite are also reduced by the presence of the observed lattice invariant deformations. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001084