(1.合肥工业大学 材料科学与工程学院，合肥230009；
2.安徽理工大学 材料科学与工程学院，淮南232001)
摘 要: 利用无压浸渗法制备高体积分数SiC的SiCp/Al复合材料。采用XRD和SEM对复合材料的相组成、微观组织及断口形貌进行分析，研究颗粒粒径分布和基体合金成分对复合材料抗弯性能的影响。结果表明：以Al-10Si-8Mg(质量分数，%)合金为基体制备的复合材料组织均匀，致密度好，无明显气孔缺陷；界面反应产物为Mg2Si、MgAl2O4和Fe，其弯曲强度高于以Al-10Si合金为基体制备的复合材料的弯曲强度；SiCp/Al复合材料的弯曲强度随着SiC颗粒粒径的增大而减小；复合材料整体上表现出脆性断裂的特征。
关键字: SiCp/Al复合材料；微观组织；弯曲性能；无压浸渗
with high volume fraction of SiCp
（1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2.School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China）
Abstract:The SiCp/Al composites with high volume fraction of SiC were fabricated by pressureless infiltration technique. The microstructures and the fracture morphologies of composites were observed by SEM and the components were analyzed by XRD. The effects of the particle size distribution and the components of aluminum matrix on the bending strength of the composites were studied. The results show that the microstructures in the SiCp/Al-10Si-8Mg(mass fraction, %) composites are quite uniform without obvious pores. The interfacial reaction products are Mg2Si, MgAl2O4 and Fe. The bending strength of the SiCp/Al-10Si-8Mg composites is better than that of the SiCp/Al-10Si composites. Besides, the bending strength of the SiCp/Al composites decreases with increasing particle size of SiCp. The composites have the character of brittleness fracture.
Key words: SiCp/Al composites; microstructure; bending strength; pressureless infiltration
