The Al–Cu–Cr alloy system was studied above 30 at.% Al by scanning electron microscopy, powder X-ray diffraction and differential thermal analysis. Partial isothermal sections at 570, 600, 650, 700, 745 and 800 °C are presented. The Al–Cr γ₁-phase was found to propagate up to 18 at.% Cu. The compositions of the earlier reported ternary phases ζ, κ, ψ and Λ were specified. The total ζ-phase range extends between ∼ Al₈₂Cu₃Cr₁₅, Al₇₅Cu₄Cr₂₁, Al_79.5Cu_7.5Cr₁₃ and Al₆₉Cu₁₁Cr₂₀, that of the κ-phase between ∼ Al₆₅Cu₁₅Cr₂₀, Al₆₀Cu_29.5Cr_10.5 and Al_57.5Cu_26.5Cr₁₆. The ψ-phase was found to be formed in a small compositional region around ∼ Al₆₅Cu_24.5Cr_10.5 at 700 and 745 °C but not already at 650 °C. At 700 °C the S-phase and the σ-phase were found to be formed in small compositional regions around ∼ Al₇₀Cu₁₉Cr₁₁ and ∼Al₆₀Cu_29.5Cr_10.5, respectively. At 650 °C the ϕ-phase (P6₃, a = 1.0985, c = 1.2673 nm) is formed in a small compositional region around ∼ Al₇₀Cu₁₉Cr₁₁ associated at 700 °C with the S-phase, while the S-phase region shifts towards higher Al. At 650 °C the Λ-phase is formed in a small compositional region around ∼ Al₆₁Cu_35.5Cr_3.5.

通过扫描电子显微镜，粉末X射线衍射和差热分析研究了Al-Cu-Cr合金系统中30％at。％以上的Al。给出了570、600、650、700、745和800°C的部分等温截面。在Al-铬γ _1个-PHASE发现原子％的Cu，以传播到18。指定了较早报道的三元相ζ，κ，ψ和Λ的组成。ζ相的总范围在〜Al ₈₂ Cu ₃ Cr ₁₅，Al ₇₅ Cu ₄ Cr ₂₁，Al _79.5 Cu _7.5 Cr ₁₃和Al ₆₉ Cu ₁₁ Cr ₂₀之间延伸，κ相的范围在〜Al之间。₆₅ Cu ₁₅ Cr ₂₀，Al ₆₀ Cu _29.5 Cr _10.5和Al _57.5 Cu _26.5 Cr ₁₆。发现在700和745°C时，在_{〜Al 65} Cu _24.5 Cr _10.5附近的小组成区域中形成了ψ相，但尚未在650°C时形成。在700°C时，发现S相和σ相分别在〜Al ₇₀ Cu ₁₉ Cr ₁₁和〜Al ₆₀ Cu _29.5 Cr _10.5周围的小组成区域内形成。在650°C时ϕ相（P 6_{如图3所示}，在 〜Al ₇₀ Cu ₁₉ Cr ₁₁ 附近的小组成区域中形成了a = 1.0985，c = 1.2673 nm，该区域在700°C下与S相相关，而S相区域向较高的Al方向移动。在650°C时，在〜Al ₆₁ Cu _35.5 Cr _3.5周围的小组成区域内形成Λ相。