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

Authors
Yokoyama, Y Note, R Yamaguchi, A Inoue, A Fukaura, K Sunada, H
Citation
Y. Yokoyama et al., Preparation of a decagonal Al-Cu-Co single quasicrystal by the Czochralskimethod, MATER T JIM, 40(2), 1999, pp. 123-131
Citations number
20
Categorie Soggetti
Metallurgy
Journal title
MATERIALS TRANSACTIONS JIM
ISSN journal
09161821 → ACNP
Volume
40
Issue
2
Year of publication
1999
Pages
123 - 131
Database
ISI
SICI code
0916-1821(199902)40:2<123:POADAS>2.0.ZU;2-0
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 p hase. The d-quasicrystal is only formed through the peritectic reaction bet ween primary crystalline cubic phase and liquid phase. In order to avoid th e peritectic reaction, the molten alloy composition was collected Al63.9Cu2 8.8Co7.9 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 quasicry stal, 30 mm in length and 1 to 5 mm in diameter, with a mean composition of about Al65Cu15Co20.