ABSTRACT In this study, graphene nanoplatelets (0.25 and 0.5 wt-%) reinforced aluminium matrix composites were synthesised. Microstructures of composites were investigated by X-ray diffraction, scanning electron microscope and transmission electron microscope. Hardness was measured according to the Vickers test method. Tensile tests were performed at both room (25°C) and elevated temperatures (150°C and 250°C). Results showed that hardness was improved with direct addition of graphene. Microstructure of composites was free of macro defects. Yield and tensile strength behaviours of pure aluminium were increased with the addition of graphene especially at room temperature. Graphene-reinforced samples have higher compressive residual stress. From the outer surface to inner surface, transition from compressive to tensile residual stress was observed for samples.

中文翻译：

---

石墨烯增强纯铝基复合材料的高温力学性能改善

摘要 在这项研究中，合成了石墨烯纳米片（0.25 和 0.5 重量％）增强铝基复合材料。采用X射线衍射、扫描电镜和透射电镜对复合材料的微观结构进行了研究。根据维氏测试方法测量硬度。拉伸测试在室温 (25°C) 和高温（150°C 和 250°C）下进行。结果表明，直接添加石墨烯可提高硬度。复合材料的微观结构没有宏观缺陷。随着石墨烯的加入，纯铝的屈服和拉伸强度行为增加，尤其是在室温下。石墨烯增强样品具有更高的压缩残余应力。从外表面到内表面，