【摘要】 为了提升金属基复合材料的力学性能，采用FSP(friction stir processing)方法制备铜/石墨烯复合材料，通过金属显微组织观察试验和力学试验对试样进行分析，探究搅拌工具转速和石墨烯添加量对复合材料微观组织特征、抗拉强度的影响规律，并对复合材料的强化机理进行研究。结果表明，石墨烯对铜基体的作用主要体现在载荷传递和阻碍铜基体中的位错运动和晶界长大方面，随着石墨烯的引入，焊核区晶粒发生了明显细化；晶粒细化的原因是搅拌工具的机械搅拌作用和晶粒再结晶过程中石墨烯对晶粒长大产生了阻碍作用；与母材相比，铜/石墨烯复合材料的抗拉强度提升了5%,最高可达277.49 MPa。因此，采用FSP方法可制备性能良好、石墨烯分布均匀的铜/石墨烯复合材料，新方法有效提升了铜合金材料的力学性能，可为复合材料的广泛应用提供理论基础和技术参考。更多还原

【Abstract】 In order to improve the mechanical properties of the metal matrix composite, the copper-graphene composites were prepared by FSP(friction stir processing) method. The samples were analyzed through the metal microstructure observation test and mechanical test, the effects of agitation speed and the amount of graphite on the microstructure and tensile strength of the composites were investigated, and the strengthening mechanism of the composites was studied. The results show that the effect of graphene on copper matrix is mainly reflected in load transfer and hindering dislocation movement and grain boundary growth in copper matrix. With the introduction of graphene, the grain in the nugget area has been significantly refined. The reason for grain refinement is the mechanical stirring of the stirring head and the obstruction of graphene to grain growth during recrystallization. The tensile strength of the copper-graphene composites is 5% higher than that of the base metal, up to 277.49 MPa. The copper-graphene composites with good properties and uniform distribution of graphene can be prepared by FSP method, which can effectively improve the mechanical properties of copper alloy and provide theoretical basis and technical reference for its wide application.更多还原