Quasicrystalline and related crystalline phases in rapidly solidified Al‒Fe alloys

D. H. Kim, B. Cantor

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The microstructural characteristics of quasicrystalline and related crystalline phases in rapidly solidified Al‒5 to 20 at% Fe alloys have been investigated by detailed transmission electron microscopy. Rapid solidification of Al‒5 to 20 at% Fe alloys produces a variety of metastable phases, depending upon alloy composition and cooling rate: microquasicrystalline, decagonal, AlmFe, Al6Fe and Al13 Fe4, in order of increasing thermodynamic stability. The Al-Fe microquasicrystalline phase consists of clusters of nm scale randomly oriented icosahedral particles, distributed in the form of either primary solidification particles or a fine scale two phase cellular structure. The microquasicrystalline phase has a solute content (≈Al6Fe) which is lower than the Al-Mn icosahedral phase (≈ Al4Mn). The Al‒Fe decagonal phase has a periodicity of 1·65 nm along the tenfold symmetry axis, forms as a primary solidification product, and has a solute content (≈Al9Fe2) which is similar to the Al‒Mn decagonal phase (≈Al4Mn). Detailed selected area electron diffraction analysis shows a close similarity between the decagonal, AlmFe and Al13Fe4 phases, suggesting that the AlmFe and Al13Fe4 phases may be approximants of the Al‒Fe decagonal phase.

Original languageEnglish
Pages (from-to)45-55
Number of pages11
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume69
Issue number1
DOIs
Publication statusPublished - 1994 Jan

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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