Gd-Co-Cu三元系Gd≤34.8wt％合金相图的室温截面已经用X射线分析法测定出来。它包括五个单相区:Cu(以下简称α),Co(以下简称β),Gd_2Co_(17)(以下简称δ),GdCu_6(以下简称γ)和Gd(Co_(1-x)Cu_x)_5(以下简称θ);七个二相区:β+δ,α+β,δ+θ,θ+γ,γ+α,θ+α,β+θ;三个三相区:α+β+θ,α+θ+γ和β+θ+δ。没有发现新相。Cu在Co中的最大固溶度约为4wt％,Gd在以Co为基的β相中的最大溶解度约为3wt％。 Gd-Co-Cu ternary system Gd ≤ 34.8wt% alloy phase diagram of the room temperature cross-section has been determined by X-ray analysis. It includes five single-phase regions: Cu (hereinafter referred to as α), Co (hereinafter referred to as β), Gd_2Co_ (17) (hereinafter referred to as δ), GdCu_6 (hereinafter referred to as γ) and Gd (Co_ (1_x) Cu_x) _5 (Hereinafter referred to as θ); seven two-phase regions: β + δ, α + β, δ + θ, θ + γ, θ, α + θ + γ and β + θ + δ. No new phase found. The maximum solubility of Cu in Co is about 4 wt%, and the maximum solubility of Gd in Co-based β phase is about 3 wt%.