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研究了变质和细化处理对搅拌法制备的１５ｖｏｌ％ＳｉＣ粒子增强的铸造Ａｌ－Ｓｉ金属基复合材料的组织和机械性能的作用。试验表明，变质和细化元素的添加对该金属基复合材料组织的影响与相应的基体合金一致。变质处理使复合材料基体合金中的片状或针状共晶硅变成纤维状，细化处理能明显地细化αＡｌ晶粒，因而能明显地提高该复合材料的拉伸性能。单独的细化处理使拉伸强度提高８％，而同时变质和细化处理使拉伸强度提高１４％。
The effect of metamorphism and refining treatment on the microstructure and mechanical properties of 15% SiC particle reinforced cast Al-Si matrix composites prepared by stirring method was studied. The experimental results show that the influence of the modified and refined elements on the microstructure of the metal matrix composites is consistent with the corresponding matrix alloy. The metamorphic sheet or needle-like eutectic silicon in the matrix alloy of the composite material is transformed into a fibrous shape by the modification treatment. The refinement treatment can obviously refine the αAl crystal grains, thereby remarkably improving the tensile property of the composite material. The refinement alone increased the tensile strength by 8% while the deterioration and refinement increased the tensile strength by 14%.