Transformation of the quasicrystalline phase Al-Cr-Fe induced by rapid solidification

A quasicrystalline phase, Q, with icosahedral symmetry was detected by x-ray diffraction and transmission electron microscopy in Al-3Cr-xFe (x=0, 1 or 3 at.%) alloys elaborated by hot extrusion of rapidly solidified powders. Chemical microanalysis showed the average composition of this phase to be 7...

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Bibliographic Details
Published in:Journal of materials science 1995-06, Vol.30 (11), p.2921-2929
Main Authors: ZIANI, A, MICHOT, G, PIANELLI, A, REDJAÏMIA, A, ZAHRA, C. Y, ZAHRA, A. M
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Quasicrystals
Semi-periodic solids
Structure of solids and liquids
crystallography
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Summary:A quasicrystalline phase, Q, with icosahedral symmetry was detected by x-ray diffraction and transmission electron microscopy in Al-3Cr-xFe (x=0, 1 or 3 at.%) alloys elaborated by hot extrusion of rapidly solidified powders. Chemical microanalysis showed the average composition of this phase to be 75plus /minus0.5% Al, 12plus/minus1% Cr, 12plus/minus1% Fe. Annealing treatments led to its transformation into the equilibrium phases Al sub 13 Cr sub 2 and Al sub 13 Fe sub 4 , directly at high temperature, or through a metastable and unknown phase, X, at intermediate temperature. This transformation was followed by X-ray diffraction, calorimetry and in situ electron microscopy. The convergent-beam technique was used for characterization of the X phase.
ISSN:0022-2461
1573-4803
DOI:10.1007/bf00349664