Highly ordered 10H-type long-period stacking order phase in a Mg–Zn–Y ternary alloy

A highly ordered long-period stacking order (LPSO) structure of 10H-type is found to form in Mg75Zn10Y15 (at.%) alloys annealed at 773K, with a remarkably developed in-plane long-range order of Zn/Y atoms. The degree of order of the present 10H-LPSO Mg–Zn–Y phase is similar to that of the Mg–Al–Gd a...

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Bibliographic Details
Published in:Scripta materialia 2014-05, Vol.78-79, p.13-16
Main Authors: Yamasaki, Michiaki, Matsushita, Masafumi, Hagihara, Koji, Izuno, Hitoshi, Abe, Eiji, Kawamura, Yoshihito
Format: Article
Language:English
Subjects:
Alloys
Annealing
Atomic structure
Long-period stacking ordered structure
Magnesium
Magnesium base alloys
Magnesium–zinc–yttrium
Order/disorder structure
Polytypes
Stacking
Stoichiometry
Ternary alloys
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Summary:A highly ordered long-period stacking order (LPSO) structure of 10H-type is found to form in Mg75Zn10Y15 (at.%) alloys annealed at 773K, with a remarkably developed in-plane long-range order of Zn/Y atoms. The degree of order of the present 10H-LPSO Mg–Zn–Y phase is similar to that of the Mg–Al–Gd alloys, the structural characteristics of which are described according to order/disorder-type intermetallic polytypes. The measured composition Mg77.2Zn9.7Y13.1 appears to be precisely consistent with an ideal stoichiometry of the 10H-Mg23Zn3Y4 (Mg76.7Zn10Y13.3) phase.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2014.01.013