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采用真空热压法制备了SiCp的体积含量为30%的SiCp/2024Al复合材料,研究了SiCp粒径对复合材料组织及性能的影响。结果表明,颗粒粒径从3.5μm增大到40μm,复合材料的抗拉强度和硬度减小,伸长率和断面收缩率增大,增强体颗粒在基体中分布越来越均匀。当SiCp粒径为25μm时,复合材料的致密度最高。复合材料的断裂由SiCp的断裂、界面处撕裂和基体的开裂等几种机理共同影响。随着颗粒粒径的增大,复合材料断裂由界面处撕裂和基体开裂转变为SiCp断裂。
The volume fraction of SiCp SiCp / 2024Al composites was prepared by vacuum hot pressing. The effect of SiCp particle size on the microstructure and properties of the composites was investigated. The results show that the particle size increases from 3.5μm to 40μm, the tensile strength and hardness of the composite decrease, the elongation and the reduction of area increase, and the reinforcement particles distribute more evenly in the matrix. When the SiCp particle size of 25μm, the highest density composites. The fracture of composite material is affected by several mechanisms such as fracture of SiCp, tearing at interface and cracking of matrix. As the particle size increases, the fracture of the composite material changes from the interface tearing to the SiCp tearing.