High-temperature stability and faceting of the icosahedral Al-Fe-Cu phase

M. Audier, P. Guyot, Y. Brechet

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Thin fragments of dodecahedral particles, extracted from an as-cast Al65Fe15Cu20alloy ingot, have been studied by transmission electron microscopy. The as-cast state is not icosahedral but trigonal and exhibits a microstructure such that the overall symmetry is pesudo-icosahedral; annealed within the microscope, this microcrystalline state transforms homogeneously into the icosahedral phase, stable until its melting point. During this second transformation (surface melting or sublimation), faceted holes of a dodecahedral shape were observed to develop within the quasicrystalline phase.

Original languageEnglish
Pages (from-to)55-62
Number of pages8
JournalPhilosophical Magazine Letters
Issue number2
Publication statusPublished - Feb 1990
Externally publishedYes

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