Abstract. The effects of microstructure on the mechanical properties of as-cast Al₇₂Ni₁₃Fe₁₅ and Al₇₂Ni₂₃Fe₅ alloys were investigated. These alloys were composed of decagonal quasicrystalline D-phase coexisting with Al-based intermetallics. The mechanical properties were characterized by means of microhardness indentation at room temperature. Fracture mode was examined by scanning electron microscopy. The ductility of the alloys tended to decrease with increasing iron content.

Key words: quasicrystalline Al–Ni–Fe alloys, mechanical properties, fracture mode.