Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys
Ist Teil von
Acta materialia, 2010-05, Vol.58 (8), p.2936-2947
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2010
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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 Mg
10Y
1Zn
1, instead of the Mg
12Y
1Zn
1 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 Mg
12Y
1Zn
1. 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.