About the AlCuFe icosahedral phase formation

In the present work, results obtained by differential thermal analysis (DTA) and X-ray diffraction (XRD) confirm [5, 8] that the icosahedral phase (i-phase) is formed by a peritectic reaction. A single i-phase can be obtained after annealing around the compositions Al 64Cu 24Fe 12Al 61.75Cu 25.5Fe...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1991-03, Vol.133, p.383-387
Main Authors: Faudot, F., Quivy, A., Calvayrac, Y., Gratias, D., Harmelin, M.
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:In the present work, results obtained by differential thermal analysis (DTA) and X-ray diffraction (XRD) confirm [5, 8] that the icosahedral phase (i-phase) is formed by a peritectic reaction. A single i-phase can be obtained after annealing around the compositions Al 64Cu 24Fe 12Al 61.75Cu 25.5Fe 12.75. For the composition Al 62Cu 25.5Fe 12.5, the XRD lines of the i-phase are narrow whatever the annealing temperature (800 °C or 600 °C). Thus, this result establishes that there exists a single phase domain where the i-phase is perfect (without phasons) and remains stable at 600 °C. A provisional vertical section along the line Al 70 Cu 20 Fe 10 Al 64 Cu 24 Fe 12 Al 58 CuPin28Fe 14 is proposed and shows the phases that exist equilibrium at various temperatures in this range of compositions.
ISSN:0921-5093
1873-4936
DOI:10.1016/0921-5093(91)90093-3