Preparation of a decagonal Al-Cu-Co single quasicrystal by the Czochralski method

Yoshihiko Yokoyama, Ryunosuke Note, Atsushi Yamaguchi, Akihisa Inoue, Kenzo Fukaura, Hisakichi Sunada

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Production of several phase diagrams including a decagonal(d)-phase in Al-Cu-Co alloy system was investigated to reveal the composition of the liquid in equilibrium with the stoichiometric Al65Cu15Co20 d-phase as objective phase. The d-quasicrystal is only formed through the peritectic reaction between primary crystalline cubic phase and liquid phase. In order to avoid the peritectic reaction, the molten alloy composition was collected Al63.9Cu28.2Co7.9 in the crucible which composition equilibrates to the Al65Cu15Co20 d-solid phase at 1173 K with the condition of the Czochralski method. As a result, we have succeeded in the production of a single decagonal quasicrystal, 30 mm in length and 1 to 5 mm in diameter, with a mean composition of about Al65Cu15Co20.

Original languageEnglish
Pages (from-to)123-131
Number of pages9
JournalMaterials Transactions, JIM
Volume40
Issue number2
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Engineering(all)

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