▎ 摘　　要

NOVELTY - Reinforcing aluminum alloy composite material by cesium oxide modified graphene comprises (i) adding cesium oxide-modified graphene into ethanol and ultrasonically treating; (ii) adding an aluminum alloy into the mixed solution, mechanically stirring; (iii) filtering the mixed solution and vacuum-drying; (iv) utilizing the composite powder and preheating; (v) configuring aluminum alloy material, adding it into a graphite crucible, heating continuously, melting the furnace completely and removing molten slag from the surface of the melt; (vi) heating aluminum alloy melt to 680-740 degrees C, adding uniformly dispersed cesium oxide modified graphene preform to preheat the cesium oxide-modified graphene preform, melting, cooling, mechanically dispersing the composite melt utilizing a mechanical stirrer, stirring; and (vii) adjusting the melt temperature of the composite material, removing the slag on the melt surface, allowing to stand and pouring into a steel mold. USE - The aluminum alloy composite material is useful for preparing lightweight high strength graphene-aluminum alloy composite material. ADVANTAGE - The method improves uniform dispersibility of graphene in the aluminum matrix, avoids graphene from being corroded by aluminum, improves the quality of the interfacial bonding of graphene and aluminum and the grain refinement structure and improves mechanical properties of aluminum-based composites. DETAILED DESCRIPTION - Reinforcing aluminum alloy composite material by cesium oxide modified graphene comprises (i) adding cesium oxide-modified graphene into ethanol at a concentration ratio of 0.5-3 g/l and ultrasonically treating for 0.1-1 hours to obtain a uniformly dispersed reinforcement mixed solution; (ii) adding an aluminum alloy having a particle size of less than 325 meshes into the mixed solution, mechanically stirring for 0.1-1 hours to obtain mixed mixture of oxidized cesium-modified graphene and aluminum alloy powder, where the mass ratio of graphene and aluminum alloy powder modified by cesium oxide is 2-10:98-90; (iii) filtering the mixed solution and vacuum-drying to obtain a composite powder in which the cesium oxide-modified graphene and the aluminum alloy powder are uniformly mixed; (iv) utilizing the composite powder to obtain a uniformly dispersed cesium oxide modified graphene preform using 50-150 MPa pressure and preheating to 50-80 degrees C; (v) configuring aluminum alloy material according to the proportion of cesium oxide modified graphene in the total mass of the composite material of 0.1-1%, adding it into a graphite crucible with a preheating temperature of 100-150 degrees C, heating continuously until the temperature rise to 700-780 degrees C, melting the furnace completely, allowing to stand for 3-5 minutes and removing molten slag from the surface of the melt to obtain molten aluminum alloy; (vi) heating aluminum alloy melt to 680-740 degrees C, adding uniformly dispersed cesium oxide modified graphene preform to preheat the cesium oxide-modified graphene preform, melting, cooling to 650-670 degrees C, mechanically dispersing the composite melt utilizing a mechanical stirrer, stirring for 1-3 minutes at a rate of 50-150 revolutions/minute to obtain composite melt having a uniform dispersion of cesium oxide-modified graphene; and (vii) adjusting the melt temperature of the composite material to 650-700 degrees C, removing the slag on the melt surface, allowing to stand for 1-5 minutes and pouring into a steel mold with a temperature of 100-150 degrees C.