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 d...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 2024A1, 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.展开更多
SiCp/5210 Al metal matrix composites with a high volume fraction(50%) of SiC particles were fabricated by squeeze casting method. The effect of particle size on the mechanical properties of the composites was studied....SiCp/5210 Al metal matrix composites with a high volume fraction(50%) of SiC particles were fabricated by squeeze casting method. The effect of particle size on the mechanical properties of the composites was studied. The results show that with the decreasing of particle size,the bending strength of the composites increases,while the fracture toughness of the composites decreases. The bending strength and fracture toughness of 10 μm SiCp/5210 Al metal matrix composite are 825 MPa,10.0 MPa·m1/2,and the fracture toughness of 63 μm SiCp/5210 Al metal matrix composite reaches 12.8 MPa·m1/2. The main fracture mechanism changes from particle crack to particle/matrix interface de-bonding with the decreasing of particle size.展开更多
文摘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 2024A1, 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.
文摘SiCp/5210 Al metal matrix composites with a high volume fraction(50%) of SiC particles were fabricated by squeeze casting method. The effect of particle size on the mechanical properties of the composites was studied. The results show that with the decreasing of particle size,the bending strength of the composites increases,while the fracture toughness of the composites decreases. The bending strength and fracture toughness of 10 μm SiCp/5210 Al metal matrix composite are 825 MPa,10.0 MPa·m1/2,and the fracture toughness of 63 μm SiCp/5210 Al metal matrix composite reaches 12.8 MPa·m1/2. The main fracture mechanism changes from particle crack to particle/matrix interface de-bonding with the decreasing of particle size.
