MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
The Structure of Type-II Al-Ni-Co Decagonal Quasicrystal Studied by Atomic-Scale Electron Microscopic Observations
Kenji HiragaTetsu OhsunaSinya Nishimura
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2001 Volume 42 Issue 6 Pages 1081-1084

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Abstract

The structure of an Al–Ni–Co decagonal quasicrystal, showing electron diffraction patterns called “type-II”, in an Al71.5Ni12.5Co16 alloy, has been examined by high-angle annular detector dark-field scanning transmission electron microscopy and high-resolution transmission electron microscopy. Its structure has a columnar cluster of atoms with a decagonal section of about 2 nm in diameter as a structural unit, and forms a heterogeneously aperiodic tiling of pentagonal and rhombic tiles in a two-dimensional arrangement of the columnar clusters. Translational arrangements of pentagons and rhombuses in the tiling can be observed locally. Also, the characteristic of a NaCl-type ordered arrangement of two kinds of columnar clusters of atoms, which have different orientations of pentagonal symmetry, is observed in the tiling.

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© 2001 The Japan Institute of Metals and Materials
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