On the phase transitions of the quasicrystalline phases in the Al-Cu-Fe-Co alloy

S. H. Kim, D. H. Kim, B. H. Kim, S. M. Lee, W. T. Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Microstructural change with Co content together with heat treatment was studied in rapidly solidified Al-Cu-Fe-Co alloys using X-ray diffractometry and transmission electron microscopy. With an increase in Co content in the as-cast Al65Cu20Fe15-xCox alloys, the relative amount of the icosahedral phase drastically decreased and that of the decagonal phase increased. In the as-melt spun alloys, effects of Co content are critically changed at around 5 at% Co. For the less Co containing alloys (below 5 at%), the icosahedral phase proved to be the major phase, while the 5 at% Co containing alloy showed the coexistence of the icosahedral and decagonal phases. The 8 at% containing alloy showed the monolithic decagonal phase in the as-melt spun state. Unlike as-cast alloys, all the as-melt spun alloys showed no trace of the λ-phase. However, after heat treatment of ribbons, λ-phase newly appeared in the Al65Cu20Fe10Co3 and Al65Cu20Fe10Co5 alloys. The λ-phase showed orientation relationships with surrounding icosahedral or decagonal phases.

Original languageEnglish
Pages (from-to)246-250
Number of pages5
JournalJournal of Alloys and Compounds
Volume342
Issue number1-2
DOIs
Publication statusPublished - 2002 Aug 14

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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