Abstract The dispersion of ceramic nanoparticles is of significance to the microstructure and properties of particulate reinforced metal matrix composites. In this study, two hybrid enhancers, SiC-graphite and SiC-graphene nanosheets (GNSs), were incorporated into aluminum matrix composites using powder metallurgy. The dispersion of the reinforcements and microstructural evolution of the composites were characterized by using Scanning Electron Microscopy, X-Ray Diffraction, Transmission Electron Microscopy, and Raman spectroscopy. The results show that thin GNSs accelerated the deformation of the aluminum particles, and defects were introduced into the carbonaceous phases during the ball milling process. Al4C3 needles generated during hot pressing, and were observed to bridge the aluminum grains. Compared with graphite, GNSs were more uniformly dispersed throughout the composite, which in turn restrained grain growth. As a result, a nanostructured composite (57.7 nm) was successfully produced upon the addition of SiC-GNSs.

中文翻译：

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粉末冶金制备的 SiC 纳米颗粒和石墨烯/石墨增强的混合铝基复合材料的微观结构演变

摘要 陶瓷纳米颗粒的分散对颗粒增强金属基复合材料的微观结构和性能具有重要意义。在这项研究中，两种混合增强剂，SiC-石墨和 SiC-石墨烯纳米片 (GNS)，使用粉末冶金技术被结合到铝基复合材料中。通过使用扫描电子显微镜、X 射线衍射、透射电子显微镜和拉曼光谱来表征复合材料的增强体的分散和微观结构演变。结果表明，薄的 GNSs 加速了铝颗粒的变形，并且在球磨过程中将缺陷引入了碳质相中。在热压过程中产生的 Al4C3 针状物被观察到与铝晶粒桥接。与石墨相比，GNS 更均匀地分散在整个复合材料中，这反过来又抑制了晶粒生长。结果，在添加 SiC-GNSs 后成功制备了纳米结构复合材料（57.7 nm）。