Investigation of the Al-Cu-Co decagonal phase with a low copper content

Abstract

The decagonal phase of compositions Al₆₈Cu₁₁Co₂₁ and Al₆₉Cu₈Co₂₃ was studied by transmission and scanning electron microscopy. The electron diffraction patterns exhibited sharp reflections at positions in reciprocal space where, at higher Cu contents, only very weak diffuse intensity occurs. This is discussed in terms of superlattice ordering in the decagonal phase.