Structure of a metastable Al3Ni decagonal quasicrystal: Comparison with a highly perfect Al72Ni20Co8

Eiji Abe, A. P. Tsai

Research output: Contribution to journalConference article

13 Citations (Scopus)

Abstract

We study the structure of a decagonal quasicrystalline phase formed in a rapidly-solidified Al3Ni alloy, by using electron diffraction and atomic-resolution Z (atomic number)-contrast scanning transmission electron microscopy (STEM). Electron diffraction patterns of the metastable Al3Ni phase reveal features quite similar to those of the stable Al72Ni20Co8 phase; a large number of reflections in the tenfold symmetry plane and no significant diffuse streaks in the twofold patterns, indicating a good quasiperiodic order of the phase. Z-contrast STEM imaging shows that the structure of the Al3Ni phase can be interpreted based on a decagonal atomic cluster column with broken tenfold symmetry, being basically isostructural with that of the Al72Ni20Co8 phase. Structural disorders are found to be significant at the core of the decagonal atomic clusters in the metastable Al3Ni decagonal phase.

Original languageEnglish
Pages (from-to)96-100
Number of pages5
JournalJournal of Alloys and Compounds
Volume342
Issue number1-2
DOIs
Publication statusPublished - 2002 Aug 14
Externally publishedYes
EventQC2001 - Sendai, Japan
Duration: 2001 Sep 242001 Sep 28

Keywords

  • Al-Ni system
  • Atomic-resolution Z-contrast
  • Decagonal quasicrystal
  • Electron diffraction
  • Metastable phase

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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