(北京交通大學 機械與電子控制工程學院，北京 100044)
摘 要: 采用真空半固態(tài)攪拌鑄造法制備40%(體積分數(shù))的高含量SiCp/A356復合材料；然后以40% SiCp/A356復合材料為原料，采用“稀釋法”分別制備出體積分數(shù)10%、20%、30% 衍生SiCp/A356復合材料。通過對比分析高體積含量復合材料稀釋制備的衍生復合材料(衍生材料)與直接攪拌制備的攪拌SiCp/A356復合材料(攪拌材 料)的斷口形貌，發(fā)現(xiàn)衍生材料的斷口質(zhì)量及顆粒分布均勻程度均優(yōu)于相同顆粒含量攪拌材料的；不同顆粒含量的孔隙率、布氏硬度、力學性能變化規(guī)律具有稀釋效應，即顆粒含量越低，對應數(shù)值越小；相同顆粒含量衍生材料的硬度比攪拌材料的高3%~5%左右，力學性能比攪拌材料的力學性能高9%~13%。
關鍵字: SiCp/A356復合材料；攪拌材料；衍生材料；半固態(tài)；攪拌鑄造
（School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China）
Abstract:SiCp/A356 composites with high content of 40% (volume content) were prepared by vacuum semi-solid stirring method, and the derived composites with 10%, 20%, 30% (volume content) particle content were prepared by dilution method with 40% (volume content) composites. By comparing the derived materials prepared by dilution of high content composites with the stirred material, prepared by direct stirring casting, it is found that the macroscopic fracture surface quality and particle distribution of the derived material are better than those of stirred material with the same particle size. The porosity, hardness and mechanical properties of the different particle content have dilution effect, that is, the lower the particle content, the smaller the corresponding value. The hardness of derived material is 3%-5% higher than that of the stirred material, and the mechanical properties of derived material are 9%-13% higher than those of the stirred material at the same SiC content.
Key words: SiCp/A356 composites; stirred material; derived material; semi-solid; stirring casting
