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

D. H. Kim, B. Cantor

Research output: Contribution to journalArticle

19 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 1

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Crystalline materials
solidification
Solidification
solutes
rapid solidification
Rapid solidification
Metastable phases
Electron diffraction
periodic variations
Thermodynamic stability
electron diffraction
Transmission electron microscopy
Cooling
cooling
thermodynamics
transmission electron microscopy
symmetry
products
Chemical analysis

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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N2 - 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.

AB - 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.

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