The Phase Diagram and Structures of the Ternary AlCuFe System in the Vicinity of the Icosahedral Region

The phase diagram of the ternary system (aluminum, copper, iron) has been systematically studied around the icosahedral region. At 680 deg C, the i-region extends approximately over a triangle with vertices of Al, Cu, and Fe composition of, respectively, 62.4--24.4--13.2, 65--23--12, and 61--28.4--1...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1992-05, Vol.153-154, p.482-488
Main Authors: Gratias, D, Calvayrac, Y, Devaud-Rzepski, J, Faudot, F, Harmelin, M, Quivy, A, Bancel, P A
Format: Article
Language:English
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Summary:The phase diagram of the ternary system (aluminum, copper, iron) has been systematically studied around the icosahedral region. At 680 deg C, the i-region extends approximately over a triangle with vertices of Al, Cu, and Fe composition of, respectively, 62.4--24.4--13.2, 65--23--12, and 61--28.4--10.6. This region splits schematically into three fields: the perfect icosahedral phase which is stable down to the lowest possible annealing temperature where atomic diffusion is active in a tiny region of composition close to Al sub 62.3 Cu sub 24.9 Fe sub 12.8 ; a well defined periodic phase with rhombohedral lattice which transforms reversibly into ico near 710 deg C in the lower part of the triangle; and a complex region characterized by additional diffraction effects (peak broadening, lineshapes, etc.) which may correspond to various approximant structures closely related to the i-phase.
ISSN:0022-3093