研究了在2618合金中添加0.3％Sc和0.3％Zr后的合金铸态及均匀化退火组织。采用金相显微镜观察合金中化合物的形貌及分布,用扫描电镜能谱分析其成分。结果表明:合金中生成的一次Al_3(Sc,Zr)相质点可作基体形核核心,对枝晶网有细化作用,从而导致铸锭枝晶间化合物分布更均匀。均匀化退火后基体中有大量弥散相析出,但很难发现有含Cu和Sc、Zr的难溶化合物出现。 The as-cast and homogenized annealed microstructure of 2618 alloy with addition of 0.3% Sc and 0.3% Zr was investigated. The morphologies and distribution of the compounds in the alloy were observed by a metallographic microscope, and the composition of the compounds was analyzed by scanning electron microscopy. The results show that the primary Al 3 (Sc, Zr) phase formed in the alloy can be used as the nucleus of matrix nucleation and refine the dendrite network, resulting in a more uniform distribution of the compounds among the ingot dendrites. After homogenization and annealing, a large amount of dispersed phase precipitates in the matrix, but it is hard to find the presence of insoluble compounds containing Cu, Sc and Zr.