Microstructure and damping behavior of SiCp/Gr/2024Al metal matrix composites by squeeze casting technology
(1.黑龙江省哈尔滨市哈尔滨工业大学金属基复合材料工程技术中心
2.Center for Metal Matrix Composites Engineering Technology,Harbin Institute of Technology, Harbin 150001, China)
2.Center for Metal Matrix Composites Engineering Technology,Harbin Institute of Technology, Harbin 150001, China)
Abstract: SiCp/Gr/2024Al metal matrix composites were processed by squeeze casting technology. The microstructure of composites was observed by SEM and TEM, and the effects of graphite particulates and SiC particulates on the damping behaviors of composites were also investigated. The results show that the microstructure of composites was dense and homogeneous, without any interfacial reactivity among reinforcement/matrix interfaces. Compared with the damping capacity of 2024Al, the damping capacity of composites was enhanced significantly by addition of SiC or graphite particulates. The main damping mechanisms of SiCp/Al composites were ascribed to the dislocation damping, and those of SiCp/Gr/2024Al were attributed to the intrinsic damping and interface damping.
Key words: metal matrix composites; SiCp/Gr/2024 composite; graphite; squeeze casting; damping capacity