Electron microscopy study of approximant phases in Al-Cr-Fe system
Résumé
We have characterized by transmission electron microscopy several new phases we have discovered in bulk alloys of the Al-Cr-Fe system. These structures are an icosahedral compound and several approximants of the decagonal phase. According to the indexation of the electron diffraction patterns (EDPs), some of the approximants are not of Fibonacci type. These EDPs correspond to nanodomains, which are due to disorder introduced by quenching the alloys after melting the pure constituent metals. For these new types of approximants, we propose a crystallographic description related to the usual Fibonacci description. In addition, we suggest a construction of the corresponding tilings. The orientation relationships between these structures are described.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
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