Abstract

The paper examines alloys in the ternary Al–Cr–Fe system in the region of compositions associated earlier with the extensive terminal Fe solid solutions in the hexagonal Al₄Cr (μ) binary phase in which iron reaches almost 12 at.%. Scanning electron microscopy, x-ray powder diffraction, and electron diffraction establish that the solubility of Fe in the μ-phase is substantially lower. Alloys Al₇₆Cr₁₉Fe₅, Al₇₆Cr₁₆Fe₈ and Al₇₅Cr₁₆Fe₉ annealed at 1000 °C have a complex base-centered orthorhombic structure with a ≈ 3.27 nm, b ≈ 1.24 nm, and c ≈ 2.34 nm.