Abstract
► We investigated the mechanical properties of aluminum and aluminum nanocomposites. ► Graphene composite had lower strength and hardness compared to nanotube reinforcement. ► Processing causes aluminum carbide formation at graphene defects. ► The carbides in between grains is a source of weakness and lowers tensile strength. Composites of graphene platelets and powdered aluminum were made using ball milling, hot isostatic pressing and extrusion. The mechanical properties and microstructure were studied using hardness and tensile tests, as well as electron microscopy, X-ray diffraction and differential scanning calorimetry. Compared to the pure aluminum and multi-walled carbon nanotube composites, the graphene–aluminum composite showed decreased strength and hardness. This is explained in the context of enhanced aluminum carbide formation with the graphene filler.
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