银钇合金组织研究

采用真空感应炉熔炼制备Ag-9.89%Y二元合金棒，借助金相显微镜、扫描电镜、X射线衍射仪和电子探针研究分析合金的铸态组织特征。结果表明，Ag-Y合金中存在块状和方形环状的初生Ag51Y14化合物相，以初生Ag51Y14相为中心形成向四周发散呈鱼鳞状交替分布的共晶组织。初生Ag51Y14相中的钇含量高于共晶Ag51Y14相。初生Ag51Y14相边界局部直接生长出共晶组织，局部围绕银固溶体组织，环状初生Ag51Y14组织里侧和外侧组织结构相似。共晶组织片层细小，平行生长方向组织呈层片状，垂直生长方向组织呈点状，2种区域含有相同的银和钇含量。

Study on the Microstructure of Ag-Y Alloy

Ag-9.89%Y binary alloy bar was prepared by vacuum induction furnace melting. The as-cast microstructure of the alloy was characterized by metallographic microscope, scanning electron microscope, X-ray diffraction and electron probe. The results showed that there were block-like and square-ring primary Ag51Y14 compound phases in the Ag-Y alloy. The eutectic structure around the primary Ag51Y14 phase as the center formed with fish-scale alternately distributing. The content of yttrium in the primary Ag51Y14 phase was higher than that in the eutectic Ag51Y14 phase. The eutectic structure was directly grown at the boundary of primary Ag51Y14 phase, and partially surrounded by Ag solid solution. The inner and outer structures of annular primary Ag51Y14 phase were similar. The eutectic structure was fine, and the parallel growth direction was lamellar, and the vertical growth direction was dot-like. The two areas contained the same Ag and Y content.