Nanocomposites Mechanical and Tribological Properties Using Graphene-Coated-SiC Nanoparticles (GCSiC_(NP)) for Light Weight Applications

摘要

In the current work, Aluminum Alloy 2124-SiC/Graphene nanocom-posite is fabricated via high energy milling followed by uniaxial cold compaction at 525 MPa, sintered at 450 ℃, and followed by hot extrusion at 4:1 extrusion ratio. SiC nanoparticles (SiC_(NP)) powders the G-micron-clusters forming G-coated-SiC_(NP) (GCSiC_(NP)) reinforcement filler, used for the reinforcement of AA2124 matrices via milling. The processed nanocomposite combines the properties suitable for dry wear resistant and self-lubricating solids. It is anticipated that the formation of GCSiC_(NP) decreases the agglomeration of SiC_(NP) producing uniform dispersion of the GCSiC_(NP) reinforcement within the Aluminum matrices. Mechanical and wear resistance of the processed GCSiC_(NP) nanocomposites were characterized compared to the milled AA2124 and AA2124-SiC_(NP) nanocomposites processed under similar milling conditions. FESEM and XRD are used for the investigation of the milled powders crystallite size, lattice strain, and phases as well as powder morphology.