▎ 摘　　要

Graphene nanoplatelets (GNPs) are the promising reinforcement material, but due to its large surface area and poor wettability, the preparation of GNPs-metal composites is still a challenging task. AZ31B magnesium alloy composites with 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.7 wt% GNPs were prepared by a "Sandwich" stacking method in this paper. The microstructure of the composites was analyzed by optical microscope and scanning electron microscopy. Experiments reveal the grain size of AZ31B-0.5GNPs composites was well refined, and GNPs was uniformly and stably distributed in the matrix alloy. The mechanical properties at room temperature show that when 0.5 wt% GNPs are added, the microhardness, yield strength, ultimate tensile strength, and fracture strain of the composite material increase by 25.8%, 44.1%, 63.5%, and 27.5%, respectively as compared to the matrix alloy. Experimental results show GNPs can be used as an excellent reinforcing phase for magnesium and alloys.