Documents disponibles écrits par cet auteur

The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys / Y.M. Zhu in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2936–2947 Titre : The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys Type de document : texte imprimé Auteurs : Y.M. Zhu, Auteur ; A.J. Morton, Auteur ; J.F. Nie, Auteur Année de publication : 2011 Article en page(s) : pp. 2936–2947 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Magnesium  alloys  18R  14H  Crystal  structure  Ordering Résumé : The 18R and 14H long-period stacking ordered structures formed in Mg–Y–Zn alloys are examined systematically using electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. In contrast to that reported in previous studies, the 18R structure is demonstrated to have an ordered base-centred monoclinic lattice, with Y and Zn atoms having an ordered arrangement in the closely packed planes. Furthermore, the composition of 18R is suggested to be Mg10Y1Zn1, instead of the Mg12Y1Zn1 composition that is commonly accepted. The 14H structure is also ordered. It has a hexagonal unit cell; the ordered distribution of Y and Zn atoms in the unit cell is similar to that in the 18R and its composition is Mg12Y1Zn1. The 18R unit cell has three ABCA-type building blocks arranged in the same shear direction, while the 14H unit cell has two ABCA-type building blocks arranged in opposite shear directions. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000364 [article] The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys [texte imprimé] / Y.M. Zhu, Auteur ; A.J. Morton, Auteur ; J.F. Nie, Auteur . - 2011 . - pp. 2936–2947. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2936–2947 Mots-clés : Magnesium  alloys  18R  14H  Crystal  structure  Ordering Résumé : The 18R and 14H long-period stacking ordered structures formed in Mg–Y–Zn alloys are examined systematically using electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. In contrast to that reported in previous studies, the 18R structure is demonstrated to have an ordered base-centred monoclinic lattice, with Y and Zn atoms having an ordered arrangement in the closely packed planes. Furthermore, the composition of 18R is suggested to be Mg10Y1Zn1, instead of the Mg12Y1Zn1 composition that is commonly accepted. The 14H structure is also ordered. It has a hexagonal unit cell; the ordered distribution of Y and Zn atoms in the unit cell is similar to that in the 18R and its composition is Mg12Y1Zn1. The 18R unit cell has three ABCA-type building blocks arranged in the same shear direction, while the 14H unit cell has two ABCA-type building blocks arranged in opposite shear directions. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000364