The Al–Cu–Ir Isothermal Section at 800 °C in the Aluminum-Rich Range

Abstract

The partial isothermal section at 800 °С is presented for the first time. The structure of the Al–Cu–Ir alloys in the Al₇₀Ir₃₀–Al₄₀Cu₆₀–Al range, which are quenched from 800 °С, is investigated by SEM/EDX and XRD methods. Three ternary phases (decagonal quasicrystalline D1, orthorhombic ε6, and cubic (fcc) C₂) are stable at this temperature. The (Al₉Ir₂), φ, ε₆, D₁, γ₁ and є₂ phases coexist with a liquid phase at 800 °С.