Interface structure between decagonal and icosahedral quasicrystals in Al-Pd-Mn alloy

Abstract

The decagonal (D) phase was formed in a melt-spun Al₇₀Pd₂₀Mn₁₀ ribbon after annealing at 800°C, and its interface to the icosahedral (I) phase was examined by conventional and high-resolution electron microscopy. The results show that growth inter race of the D-phase is characterized by a stepped structure constructed of interfacial facets and ledges. The interfacial facets are parallel to the (tenfold plane)_D ∥ (fivefold plane)_I, along which a good match between the D- and I-phases has been observed. These observations suggest a possible ledge growth mechanism of the D-phase.