Documents disponibles écrits par cet auteur

Variant selection during secondary twinning in Mg–3%Al / É. Martin in Acta materialia, Vol. 58 N° 11 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3970–3983 Titre : Variant selection during secondary twinning in Mg–3%Al Type de document : texte imprimé Auteurs : É. Martin, Auteur ; L. Capolungo, Auteur ; L. Jiang, Auteur Année de publication : 2011 Article en page(s) : pp. 3970–3983 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Twinning  Double  twinning  Magnesium  EBSD  Variant  selection Résumé : Secondary twin formation during the tensile deformation of Mg–3.4%Al–0.33%Mn was studied by means of the electron backscatter diffraction technique. This was employed to identify the particular variants that formed in each grain. For this purpose, the variants were characterized with respect to the orientation of the parent grain rather than that of its host primary twin. This approach led to a regrouping of the 36 possible variants into four sets, namely SA, SB, SC and SD, consisting of variants that are geometrically equivalent. A statistical analysis revealed that the observed secondary twins were almost entirely of SA and SD type (misorientations of 37.5° and 69.9°, respectively). The former variant is shown to require the least accommodation strain within the parent grain and to have the greatest potential for growth. Formation of the SD variant, in contrast, can be attributed to its being favored by the highest resolved shear stresses, i.e., it obeys Schmid’s law. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001722 [article] Variant selection during secondary twinning in Mg–3%Al [texte imprimé] / É. Martin, Auteur ; L. Capolungo, Auteur ; L. Jiang, Auteur . - 2011 . - pp. 3970–3983. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3970–3983 Mots-clés : Twinning  Double  twinning  Magnesium  EBSD  Variant  selection Résumé : Secondary twin formation during the tensile deformation of Mg–3.4%Al–0.33%Mn was studied by means of the electron backscatter diffraction technique. This was employed to identify the particular variants that formed in each grain. For this purpose, the variants were characterized with respect to the orientation of the parent grain rather than that of its host primary twin. This approach led to a regrouping of the 36 possible variants into four sets, namely SA, SB, SC and SD, consisting of variants that are geometrically equivalent. A statistical analysis revealed that the observed secondary twins were almost entirely of SA and SD type (misorientations of 37.5° and 69.9°, respectively). The former variant is shown to require the least accommodation strain within the parent grain and to have the greatest potential for growth. Formation of the SD variant, in contrast, can be attributed to its being favored by the highest resolved shear stresses, i.e., it obeys Schmid’s law. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001722