New stable icosahedral al-cu-ru and al-cu-os alloys

An Pang Tsai, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

197 Citations (Scopus)


A thermodynamically stable quasi-crystalline single phase with an icosahedral structure was found to be formed at atomic compositions of Al65Cu20Ru15 and Al65Cu20Os15 in conventionally solidified and fully annealed states as well as in a rapidly solidified state. The quasi-crystalline nature determined by X-ray diffractometry is the highest for the fully annealed ingot, indicating the existence of a truly equilibrium icosahedral structure. The stable quasi-crystals appear to have a growth morphology of pentagonal dodecahedron with an average size of 0.03 mm in a fully annealed state.

Original languageEnglish
Pages (from-to)L1587-L1590
JournalJapanese journal of applied physics
Issue number9 A
Publication statusPublished - 1988 Sep
Externally publishedYes


  • Al-Cu-Os system
  • Al-Cu-Ru system
  • Growth morphology
  • Icosahedral alloy
  • Neutron diffraction
  • Pentagonal dodecahedron
  • Stable quasi-crystal

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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