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Formation of Icosahedral Quasicrystals in Mg-Al-X (X=Transition Metal) Ternary Systems

Published online by Cambridge University Press:  17 March 2011

Naokiyo Koshikawa ,
Shinichi Yoda ,
Keiichi Edagawa  and
Shin Takeuchi
Naokiyo Koshikawa
Affiliation:
National Space Development Agency of Japan / Tokyo Institute of Technology Sengen 2-1-1, Tsukuba, Ibaraki 305-8505, Japan/ 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
Shinichi Yoda
Affiliation:
National Space Development Agency of Japan / Tokyo Institute of Technology Sengen 2-1-1, Tsukuba, Ibaraki 305-8505, Japan/ 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
Keiichi Edagawa
Affiliation:
Institute of Industrial Science, University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan
Shin Takeuchi
Affiliation:
Science University of Tokyo, 641 Yamazaki, Noda-shi, Chiba 278-8510, Japan
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Abstract

Formation of icosahedral quasicrystalline phase (i-phase) was investigated for Mg-Al-X (X=Co, Ni, Cu, Rh, Ag, Pt and Au) ternary systems. A Mackay-icosahedron (MI) type i-phase was found to form in the Mg-Al-Rh system at the composition Mg8Al68Rh24. The i-phase has the F-type ordered structure and the quasilattice constant is 0.447nm. Differential thermal analysis (DTA) studies showed that the i-phase has a high stability. On the other hand, the formation of a Frank-Kasper (FK) type i-phase was found in the Mg-Al-Pt system at the composition Mg45Al42Pt13. The conditions necessary for the formation of the i-phases are discussed in terms of the atomic radius ratio and the electronegativity as well as the electron-per-atom ratio.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K9.3
Copyright
Copyright © Materials Research Society 2001

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