Formation of Icosahedral Quasicrystals and 1/1 Crystal Approximants in Al-Pd-RE (RE: Rare Earth Metals) Systems

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  • So Yeong-Gi
    Institute of Industrial Science, The University of Tokyo
  • Yoshikawa Takuro
    Department of Materials Science and Technology, Tokyo University of Science
  • Saruhashi Fukuaki
    Department of Materials Science and Technology, Tokyo University of Science
  • Edagawa Keiichi
    Institute of Industrial Science, The University of Tokyo
  • Tamura Ryuji
    Department of Materials Science and Technology, Tokyo University of Science

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We have investigated the formation of an icosahedral quasicrystal (i-phase) and its 1/1-crystal approximant (1/1-phase) in the (Al, Ga)-Pd-RE (Rare earth metals) systems. Consequently, the Ga-Pd-Sc 1/1-phase, the Al-Pd-RE (RE = Yb, Tm and Er) 1/1-phase and the Al-Pd-Yb i-phase have been newly found by the substitution of Al for Ga, or Sc for other RE in the constituent elements of the Al54Pd30Sc16 i-phase previously reported. For the i- and the 1/1-phases studied in this work, the number of valence electrons per atom (e⁄a) ratio is 2.10 and the atomic radius ratio of the rare earth element to that of the other base elements is in the range 1.15–1.24, which fulfilled the formation conditions previously reported for other Tsai-type i-phases. On the other hand, the stability of the i-phases becomes lower with increasing the atomic radii of the RE elements, which indicates that the atomic radius ratio plays important role in the formation of the Al-Pd-RE i- and 1/1-phases.

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 52 (11), 2011-2015, 2011

    公益社団法人 日本金属学会

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