Formation and stability of quasicrystalline and hexagonal approximant phases in an Al-Mn-Be alloy

G. S. Song, E. Fleury, S. H. Kim, W. T. Kim, D. H. Kim

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Phase formation and thermal stability for an Al-Mn-Be alloy have been investigated by melt-spinning and conventional casting. Significant differences in the phase formation and the thermal stability of the microstructure were found as a result of the different cooling rates. In the melt-spun ribbons, a large volume fraction of a metastable icosahedral phase was found to coexist with an Al solid solution. In the bulk cast ingots, the primary phase formed in the two-phase microstructure was a hexagonal approximant phase of quasicrystals. This phase that solidified in the form of faceted particles embedded in the Al solid matrix proved to be thermodynamically stable during annealing at 540 °C for 100 h. The effect of Be addition on the formation of the stable approximant phase is discussed in terms of the Hume-Rothery mechanism.

Original languageEnglish
Pages (from-to)1671-1677
Number of pages7
JournalJournal of Materials Research
Volume17
Issue number7
DOIs
Publication statusPublished - 2002 Jul

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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