▎ 摘　　要

Magnesium-matrix composites reinforced with graphene nanosheets (Mg-Gr) were fabricated using a combination of powder metallurgy and hot rolling. The effects of the graphene-nanosheet content on the microstructures and density of the composites were investigated. It was found that the graphene nanosheets were gradually dispersed in the magnesium matrix with an increasing ball-milling time and a uniform dispersion was achieved after 72 h for the composite with a graphene content of 1.0 % of mass fraction. In addition, no obvious agglomeration of graphene was observed in the as-sintered and as-rolled composites with the graphene contents of up to 1.0 % of mass fraction. A coordinated deformation of multilayer graphene nanosheets occurs with a deformation of the surface grains during the rolling, which may cause a significant reduction in the number of layers of the graphene nanosheets. When increasing the graphene content, the density of the Mg-Gr composites shows an increase.