铝－铜－镓三元系富铜合金的室温固相截面已经用Ｘ射线分析法测定出来了，并对每一个相区的相边界都作了精密的测定．合金含量最高达５０％（重量）１）铝及５０％镓． 室温相截面由７个单相（即）相区、１０个双相　区和７个三相（即　　　　　　 所构成．所有单相和三个二元系内所有单相相同，没有新相出现． The room temperature solid phase cross section of aluminum-copper-gallium ternary copper-rich alloys has been determined by X-ray analysis and the phase boundary of each phase has been precisely measured. Alloy content up to 50% by weight 1) Aluminum and 50% gallium. The room temperature phase section consists of seven single-phase (ie) phase regions, ten dual-phase regions and seven three-phase phases (ie all single-phase and three binary systems are identical in one single phase and no new phase appears.