ECAP对(0.5CNTs+0.5GNPs)/AZ31复合材料显微组织及力学性能的影响

Effects of ECAP on Microstructure and Mechanical Properties of (0.5CNTs+0.5GNPs)/AZ31 Composite

摘要: 采用粉末冶金法制备了石墨烯（GNPs）与碳纳米管（CNTs）混杂增强AZ31镁基复合材料，并研究了等径通道角挤压（ECAP）对（GNPs+CNTs）/AZ31复合材料的显微组织及力学性能的影响。研究结果表明，ECAP变形能显著细化该复合材料的晶粒，有效提升该复合材料致密度、显微硬度和强度，屈服强度提高的主导强化机制为细晶强化；除此之外，ECAP变形基本不改变该复合材料的断裂应变及断裂类型。

Abstract: Graphene(GNPs)reinforced AZ31 magnesium group composite with carbon nanotubes(CNTs)was prepared by powder metallurgy method, and then the effects of equal channel angular pressing (ECAP) on the microstructure and mechanical properties of the composites were investigated. The results show that ECAP can significantly refine the grains of the composite, and effectively improve its relative density, microhardness and strength. And the dominant strengthening mechanism for yield strength improvement is fine crystal reinforcement.In addition, the ECAP deformation basically does not change the fracture strain and fracture types of the composite.