Abstract
We have identified two γ-brass phases in the Al–Cr–Fe system by X-ray diffraction and transmission electron microscopy. These structures (rhombohedral and cubic) are closely related to each other and can co-exist in the same alloy together with approximants of quasicrystals. In particular, a long-period superlattice, typical of γ-brass phases, was characterized in the cubic structure. This superstructure is constituted of inversion domains separated by boundaries lying at ( 10) planes. The displacement vector between like domains was determined from high resolution microscopy data. This study deals also with a description of some structural links between γ-brass phases and approximants of decagonal and icosahedral quasicrystals.
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