Solidification paths for an icosahedral quasicrystalline phase in cast Al62Cu25.5Fe12.5 and Al55Cu25.5Fe12.5Be7 alloys

G. S. Song, M. H. Lee, W. T. Kim, D. H. Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The solidification behavior of the icosahedral (i) phase in (Al62-xBex)Cu25.5Fe12.5 (x = 0,7) alloys has been investigated using a conventional casting technique. It was observed that the addition of beryllium (Be) modified the i-phase formation mechanism from peritectic reaction to primary solidification compared to as-cast Al62Cu25.5Fe12.5 alloy. The establishment of the new solidification path is attributed to the narrowing of the freezing range resulting from the beryllium addition. However, the resolidification at a slow cooling rate could result in the formation of the i-phase by peritectic reaction. The conversion of the initial solidification path to the peritectic solidification was attributed to a cooling rate effect resulting from the elaboration process. A new decomposition process of the bulk single i-phase in the Be-containing alloy is also proposed in the present paper.

Original languageEnglish
Pages (from-to)254-262
Number of pages9
JournalJournal of Non-Crystalline Solids
Volume297
Issue number2-3
DOIs
Publication statusPublished - 2002 Feb

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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