Microstructures and Mechanical Properties of GNS/A1 Composites Fabricated by Spark Plasma Sintering

摘要

In this paper, 0.5 vol. % graphene nanosheets (GNS) reinforced aluminum matrix composites were fabricated by solution ball milling (SBM) and spark plasma sintering (SPS) methods. In order to investigate the effects of original morphology of A1 powder on dispersion of GNS and mechanical properties, spherical A1 and flaky A1 powders a used as raw matrix. The dense GNS/A1 composites were obtained at a relatively low sintering temperature (400 °C) and no Al_4C_3 phase was found. Tensile properties of the GNS/A1 composites were measured. The results indicate that the yield strength of the GNS/A1 composites are enhanced because of the strengthening effect of GNS. However, the elongation of GNS/A1 decreases drastically. Furthermore, the strengthening effect of GNS in flaky is more obvious than that in spherical Al.