A contribution to the Al–Ni–Cr phase diagram

The Al–Ni–Cr phase diagram was specified at 1000 °C and partially at 900 °C. The results concerning the region below 60 at.% Al agreed qualitatively with the literature data. The binary Al–Cr phases μ and γ dissolve up to ∼1 and ∼3 at.% Ni, respectively, and Al3Ni2 up to ∼2.5 at.% Cr. Two ternary phases were revealed: hexagonal ζ (a ≈ 1.77, c ≈ 1.24 nm) in a wide range between Al81Ni3Cr16, Al76.5Ni3Cr20.5, Al76.5Ni9Cr14.5 and Al71.5Ni9Cr19.5, and high-temperature orthorhombic ɛ (a ≈ 1.26, b ≈ 3.48, c ≈ 2.02 nm) around Al76.5Ni2.0Cr21.5.