Fabrication of SiC nanoparticulates reinforced Al matrix composites by combining pressureless infiltration with ball-milling and cold-pressing technology

摘要

The SiC nanoparticulate reinforced Al-3.0 wt.% Mg composites with 6 vol.%, 10 vol.% and 14 vol.% were suc-cessfully fabricated by combining pressureless infiltration with ball-milling and cold-pressing technology at 700°C for 2h. Microstructures and nanoparticulate distribution were analyzed with scanning elec-tron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM). Mechanical property and hardness were studied at room temperature. The results show that the SiC nanoparticu-lates were distributed uniformly in metal matrix. The fabricated composites exceeded 98% in theoretical density. MgO at the interface can enhance the wettability and provide a barrier for the diffusion of Si, C and Al. Compared to the mechanical property and hardness of Al alloy matrix, those of nanocomposites were increased significantly, while the ductility was retained.