以纯镁和Mg-30Ce中间合金为原料铸造铈质量分数为1%的Mg-Ce合金，并进行420 ℃×8 h固溶和200 ℃×20 h时效处理，研究了不同状态时合金中稀土相分布的变化规律。结果表明：铸态、固溶态和时效态合金中的稀土相均为Mg₁₂Ce；铸态合金中的稀土析出相分布不均匀，以晶界处析出为主，晶粒内析出为辅，且析出相尺寸、形貌差异较大；固溶处理后，稀土相大多溶解于镁基体，但晶界处和部分晶粒内仍有一定量残余；时效处理后稀土相在晶粒内重新均匀、弥散析出，晶界处析出量较少，与铸态合金相比，析出相尺寸更加细小、分布更加均匀。

With pure magnesium and Mg-30Ce master alloy as raw materials, the Mg-Ce alloy with 1wt% Ce was prepared by casting, and treated by solution at 420 ℃ for 8 h and aging at 200 ℃ for 20 h. The change of rare earth phase distribution in the alloy in different states was studied. The results show that the rare earth phases of the as-cast, solution-treated and aging-treated alloy were all Mg₁₂Ce. The distribution of rare earth precipitation phases in the as-cast alloy was uneven, which was dominated by boundary precipitation and supplemented by in-grain precipitation, and the size and morphology of the precipitation phase were quite different. After solution treatment, most of the precipitated rare earth phase was soluted in the magnesium matrix, but there were still a certain number of rare earth phases at grain boundaries and in part of grains. After the aging treatment, the rare earth phase uniformly dispersed in grains, and the amount of precipitation at grain boundaries was smaller. Compared with the as-cast sample, the precipitated phase after aging was smaller in size and distributed more uniformly.