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为了研究微米级碳化硅颗粒(SiCp)尺寸对中体积分数SiCp增强铝基复合材料的拉伸性能与强化机制的影响,用粉末冶金工艺制备体积分数为30%的SiCp/2024Al复合材料,利用OM,SEM,万能材料试验机等对材料微观结构和拉伸性能进行了研究。结果表明,复合材料的拉伸强度随着SiCp尺寸的减小而增大。当SiCp尺寸为3μm时,复合材料的断裂主要以界面处的基体合金撕裂为主;当SiCp尺寸为25μm和40μm时,复合材料的断裂以SiCp解理断裂为主;当SiCp尺寸为8μm和15μm时,复合材料的断裂方式是以界面处的基体合金撕裂和SiCp的断裂共同作用。3μm SiCp增强复合材料相对密度不高、SiCp分布不均匀但其拉伸强度最大,主要原因为受力时小SiCp极少断裂和小颗粒效应导致基体的显微组织强化。
In order to study the effect of size of SiC particles on the tensile properties and strengthening mechanism of SiCp reinforced aluminum matrix composites, the SiCp / 2024Al composites with volume fraction of 30% were prepared by powder metallurgy. , SEM, universal material testing machine and other materials on the microstructure and tensile properties were studied. The results show that the tensile strength of composites increases with the decrease of SiCp size. When the size of SiCp is 3μm, the fracture of the composites is dominated by the rupture of the matrix alloy at the interface. When the size of SiCp is 25μm and 40μm, the fracture of the composites is dominated by the cleavage of SiCp. When the SiCp size is 8μm and At 15μm, the fracture mode of the composites is based on the rupture of the matrix alloy and the fracture of SiCp at the interface. The relative density of 3μm SiCp reinforced composites is not high, and the distribution of SiCp is not uniform but the tensile strength is the largest. The main reason is that the microstructure of the matrix is strengthened by the small fracture of SiCp and the small particle effect.