(1. 福州大学材料科学与工程学院，福州 350116；
2. 福建工程学院材料科学与工程学院，福州 350118；
3. 福建省新材料制备与成形技术重点实验室，福州 350118)
摘 要: 碳纳米管(CNT)和石墨烯(Graphene)拥有优秀的力学和物理性能，是金属基复合材料中理想的增强体。本文采用球磨工艺+氢热还原法将碳纳米管(CNT)和还原氧化石墨烯(RGO)引入到铝粉表面构建CNT-RGO混合增强体，然后利用放电等离子烧结系统(SPS)和轧制工艺，制备CNT-RGO/Al复合材料。通过EBSD、SEM、TEM以及拉伸等方法分析研究了CNT-RGO/Al复合材料内CNT和RGO增强相分布、界面结构、晶粒形貌和力学性能，探索了复合材料内CNT和RGO的协同强化机制。结果表明：CNT-RGO/Al复合材料表现出优异的力学性能，屈服强度和抗拉强度分别为228 MPa和268 MPa，比纯铝的屈服强度和抗拉强度分别增大了153%和143%，伸长率仍保持在8.5%。复合材料内还原氧化石墨烯的添加不仅促使一维的CNT和二维的RGO形成桥连结构，有益于载荷的传递，而且能够调控C与Al基体间的界面反应，有利于复合材料的C-Al界面结合。CNT-RGO混合增强体协同强化效果优于单纯的一维CNT增强体。
关键字: 铝基复合材料；碳纳米相；微观组织；力学性能；界面特征
（1. School of Materials Science and Engineering, Fuzhou University,
Fuzhou 350116, China;
2. School of Materials Science and Engineering, Fujian
University of Technology, Fuzhou 350118, China;
3. Fujian Provincial Key Laboratory of Advanced
Materials Processing and Application, Fuzhou 350118, China）
Abstract:Carbon nanotubes (CNT) and graphene (Graphene) have excellent mechanical and physical properties and are ideal reinforcements in metal matrix composites. In this paper, ball milling process and hydrogen thermal reduction method were used to construct CNT-RGO hybrid reinforcement on the surface of aluminum powder, and then spark plasma sintering system (SPS) and rolling process were used to prepare CNT-RGO/Al composites. The CNT and RGO enhanced phase distribution, interface microstructure, grain morphology and mechanical properties were studied by EBSD, SEM, TEM and stretching, and the collaborative reinforcement mechanism of CNT and RGO in the CNT-RGO/Al composite was investigated. The results show that the CNT-RGO/Al composite exhibits excellent mechanical properties. The yield strength and tensile strength are 228 MPa and 268 MPa, respectively, which are higher than those of pure aluminum. The yield strength and tensile strength of CNT-RGO/Al composite increase by 153% and 143%, respectively compared with those of pure aluminum, and the elongation of CNT-RGO/Al composite still remains 8.5%. The addition of graphene in the composite not only causes the one-dimensional CNT and the two-dimensional RGO to form a bridge structure, which effectively refines the grains, and is beneficial to the transfer of load, but also promotes the interfacial reaction between C and Al, which is beneficial to bonding. C-Al interface of the material. The synergistic strengthening effect of CNT-RGO hybrid reinforcement is better than that of simple one-dimensional CNT.
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