The structure of an Al-Co-Ni crystalline approximant with an ordered arrangement of atomic clusters with pentagonal symmetry

K. Hiraga, T. Ohsuna, K. Yubuta, S. Nishimura

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The structure of a crystalline approximant (called "PD3c phase") in an Al71.5Co16Ni12.5 alloy annealed at 900°C for 120 h has been studied by high-angle annular detector scanning transmission electron microscopy (HAADF-STEM) and high-resolution transmission electron microscopy (HREM). The PD3c phase has an orthorhombic structure with lattice parameters a = 5.2 nm, b = 0.4 nm and c = 3.7 nm, and the space group of Pmn21 (No. 31). Its structure is characterized as an ordered arrangement of columnar atom clusters with pentagonal symmetry, and can be interpreted as a crystalline approximant related to an ordered decagonal quasicrystal formed by the projection of a NaCl-type hypercubic lattice.

Original languageEnglish
Pages (from-to)897-900
Number of pages4
JournalMaterials Transactions
Volume42
Issue number5
DOIs
Publication statusPublished - 2001

Keywords

  • Aluminium-nickel-cobalt
  • Crystalline approximant
  • Decagonal quasicrystal
  • Quasicrystal
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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