Liquid–solid equilibria in the quasicrystalline regions of the Al–Pd–Mn phase diagram

Phase equilibria were investigated in the Al–Pd–Mn phase diagram in the region where quasicrystals and approximant phases form. With respect to previous thermodynamic studies, the extents of the liquidus phase fields of several approximant phases are either established or precisely determined. In pa...

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Bibliographic Details
Published in:Journal of alloys and compounds 2000-01, Vol.296 (1), p.128-137
Main Authors: Klein, Holger, Durand-Charre, Madeleine, Audier, Marc
Format: Article
Language:English
Subjects:
Applied sciences
Approximant phases
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of metals and alloys
Phase equilibria
Physics
Quasicrystals
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Summary:Phase equilibria were investigated in the Al–Pd–Mn phase diagram in the region where quasicrystals and approximant phases form. With respect to previous thermodynamic studies, the extents of the liquidus phase fields of several approximant phases are either established or precisely determined. In particular, compositional profiles across interfaces show the ternary character of the T(AlPdMn) and ξ′ phases which are close to the binary Al–Mn and Al–Pd limits respectively. It is pointed out that the relative stability of some of the phases involves very small energy differences leading to very long transformation times and the solidification of metastable phases.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(99)00495-8