粉末冶金法制备石墨烯/2024Al复合材料的组织及性能研究

Microstructure and properties of graphene/2024Al composites prepared by powder metallurgy

本文以石墨烯纳米片和2024Al合金粉末为原材料,利用冷等静压+真空烧结+热挤压的方法制备了不同质量分数的石墨烯/2024Al复合材料,通过对复合材料进行SEM表征、能谱分析以及力学性能测试,研究了不同质量分数石墨烯/2024Al复合材料微观组织和宏观性能。结果表明:经过冷等静压+烧结后的石墨烯/2024Al复合材料中石墨烯呈现随机分布,此时致密度较低。通过热挤压后,能够使石墨烯呈定向排列,且显著提高复合材料的致密度。0.5%和1%挤压态石墨烯/2024Al复合材料的抗拉强度可分别达到290.6 MPa和321.1 MPa,相比基体分别提高了48.8%和64.4%,表明石墨烯的引入以及质量分数的增加能显著提高复合材料的抗拉强度。

In this paper, graphene nanosheets and 2024Al alloy powder were used to prepare graphene/2024Al matrix composites with different contents by the method of cold isostatic pressing + vacuum sintering + hot extrusion.The microstructure and mechanical properties of graphene/2024Al with different contents were investigated by SEM characterization, EDS analysis and property tests. The results show that the graphene in the composite presents a random distribution after cold isostatic pressing and vacuum sintering, and the density of composite is relatively low in this case. But when the graphene/2024Al composite is hot-extruded, the graphene in the composite presents an aligned arrangement, and the density of composite is obviously enhanced. Then tensile strength of0.5% and 1% hot-extruded graphene/2024Al composite reaches 290.6 MPa and 321.1 MPa, which is improved by48.8% and 64.4% compared with the 2024Al matrix, respectively. These results show that the addition of graphene and the increase of graphene content can effectively enhance the tensile strength of graphene/Al composite.