颗粒尺寸及分布均匀性对SiC/Al-30Si复合材料组织性能的影响  

Effects of particle size and its distribution homogenization on the microstructure and mechanical properties of SiC/Al-30Si alloy composite

作　　者：王爱琴[1] 倪增磊[1] 谢敬佩[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《粉末冶金技术》2013年第1期9-13,共5页Powder Metallurgy Technology

基　　金：河南省国际合作项目基金(084300510006)

摘　　要：采用真空热压法制备SiCp/Al-30Si复合材料。利用扫描电镜对材料的微观组织进行表征,检测力学性能。结果表明:随着SiC颗粒平均粒径的增大,材料的组织中SiC颗粒的团聚现象逐渐消失,其在基体中的分布更加均匀。抗拉强度与增强体颗粒尺寸有关,SiC颗粒平均粒径为13μm时,材料的抗拉强度最大。材料的断裂方式为脆性断裂,SiC颗粒粒径为4μm时,断口表面有团聚、裸露的SiC颗粒;SiC颗粒粒径为13μm时,断口SiC颗粒表面包覆着一层铝硅合金;SiC颗粒粒径为30μm时,断口处有断裂的SiC颗粒,部分SiC颗粒从基体中被拔出。SiCp/Al-30Si composites were fabricated by vacuum hot pressing plus sintering. The microstruetures of the materials were analyzed by SEM, and the tensile strength was examined. The results show that, with the increase of the SiC particle size in the composites, the clustering degree of the SiC particles decreases in the matrix, the SiC particles distribute more ununiformly. The tensile strength is influenced by the SiC particle size, the tensile strength of the composite reinforced by 13μm sized SiC particles is the highest. Fracture surface observations show that the dominant fracture mechanism of the composites is brittle fracture, the clustering bare SiC particles exist in the fracture surface of the composite reinforced by 4μm sized SiC particle; when the SiC size is 13μm, the SiC panicles of the fracture surface coat with a layer of A1-Si alloy; when the SiC size is 30μm, some cracked SiC particles exist in the fracture surface with pull-out of the particles from the matrix.

关 键 词：SIC颗粒 颗粒分布均匀性 抗拉强度 复合材料 

分 类 号：TG146.21[一般工业技术—材料科学与工程]