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对普通ＳｉＣ颗粒和钝化处理过的ＳｉＣ颗粒增强ＬＤ２铝复合材料的研究表明，颗粒经钝化处理后，几乎去除了很尖锐的部分，使颗粒呈近等轴状，但颗粒的形状对两种热处理态的复合材料（热挤出态和Ｔ６态）的断裂韧性ＫＱ均无影响，而热挤出态的复合材料ＫＱ低于Ｔ６态。断口和断裂路径的扫描电镜分析表明，Ｔ６处理提高了材料的屈服强度从而提高了材料的裂纹生成能，而同一热处理态的复合材料中，由于增强体之间间距过小等原因，基体受增强体胁迫，不能充分变形，降低了材料的裂纹扩展能，是复合材料低韧性的主要原因。
The study of ordinary SiC particles and passivated SiC particles reinforced LD2 aluminum composite showed that the particles were almost passivated after passivation treatment to make the particles nearly equiaxed, The heat-treated composites (hot-extruded state and T6-state) had no effect on the fracture toughness KQ, whereas the hot-extruded composite KQ was lower than the T6 state. Scanning electron microscopy analysis of the fracture surface and fracture path shows that the T6 treatment increases the yield strength of the material and thus improves the crack generation energy of the material. In the same heat-treated composite material, the matrix is strengthened due to the small spacing between the reinforcement bodies Body stress, can not be fully deformed, reducing the material crack propagation energy is the main reason for the low ductility of the composite material.