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, Do Hyang 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 Jan 1

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Thermodynamic stability
Quasicrystals
Microstructure
Metastable phases
Melt spinning
thermal stability
Ingots
Solid solutions
Volume fraction
Casting
microstructure
melt spinning
ingots
Annealing
Cooling
ribbons
casts
solid solutions
cooling
annealing

All Science Journal Classification (ASJC) codes

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

Cite this

Song, G. S. ; Fleury, E. ; Kim, S. H. ; Kim, W. T. ; Kim, Do Hyang. / Formation and stability of quasicrystalline and hexagonal approximant phases in an Al-Mn-Be alloy. In: Journal of Materials Research. 2002 ; Vol. 17, No. 7. pp. 1671-1677.
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Formation and stability of quasicrystalline and hexagonal approximant phases in an Al-Mn-Be alloy. / Song, G. S.; Fleury, E.; Kim, S. H.; Kim, W. T.; Kim, Do Hyang.

In: Journal of Materials Research, Vol. 17, No. 7, 01.01.2002, p. 1671-1677.

Research output: Contribution to journalArticle

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AU - Fleury, E.

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AB - 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.

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