Preparation of large grained Al64Cu23Fe13 icosahedral quasicrystal directly from the melt

Yoshihiko Yokoyama, Kenzo Fukaura, Hisakichi Sunada

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Various phase diagrams including an icosahedral (i-) phase in Al-Cu-Fe alloy system were examined in order to reveal the composition of the liquid in equilibrium with the Al64Cu23Fe13 i-phase. The i-phase was formed through the peritectic reaction between the liquid and the primary λ2-crystal. Prevention of the peritectic reaction was necessary to produce a single quasicrystal, however, there was a little compositional area of the molten alloy, which can crystallize the i-phase as a primary crystal. In the conventional solidification of Al60Cu37Fe3 alloy, almost primary crystalline particles were classified as i-phase, and the rests were λ2-phase. The λ2-particles acted as the inhomogeneous crystallization sites of an i-quasicrystal growth. So, several metallurgical treatments were tried to prevent the λ2-crystallization. Consequently, we found out an Al59Cu37Fe3Si1 molten alloy, which can crystallize the Al64Cu23Fe13 i-phase as a primary crystal at 978 K. The Al59Cu37Fe3Si1 molten alloy should be treated the preliminary cyclic melting process to prevent the λ2-crystallization. And we succeeded to grow up the large grained Al64Cu23Fe13 i-quasicrystal directly from the molten alloy.

Original languageEnglish
Pages (from-to)668-674
Number of pages7
JournalMaterials Transactions, JIM
Volume41
Issue number6
DOIs
Publication statusPublished - 2000 Jun

ASJC Scopus subject areas

  • Engineering(all)

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