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中文摘要：
采用金相显微镜、扫描电子显微镜和X-光衍射仪研究了稀土Gd、Ho变质对Al-7Si-0.4Mg铸造铝合金显微组织的影响。研究结果发现,Gd、Ho变质具有细化初生α-Al晶粒以及对共晶硅变质的作用。添加Gd、Ho可在铸态合金中形成GdAl2Si2和HoAl3化合物,但Ho形成HoAl3化合物的能力最强,综合考虑添加0.1%（质量分数）Gd可以作为该铝合金的细化剂,而Ho由于形成较多高熔点化合物,不适合用作该合金的变质剂或细化剂。
英文摘要：
The microstructure of Gd and Ho modified Al-7Si-O. 4Mg aluminum alloys was studied by using metallurgical microscope, scanning electronic microscope （SEM） and X-ray diffractimeter （XRD）. Experimental results show that, Gd and Ho additions can refine the primary α-Al grains and modify the eutectic Si; and can form the components of GdAl2Si2 and HoAl3. Ho has a stronger ability to form HoAl3 than Gd to form GdAl2 Si2 even adding 0.1% mass. In an overall consideration, 0.1% Gd can be used as the refiner for the alloy, but Ho can not be used because of the existence of more HoAl3 compound with high melting point.
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