Simultaneously achieving high strength and ductility is a critical issue for graphene reinforced aluminum matrix composites, which couldn't be resolved by the conventional mechanical milling-powder metallurgy technology due to the following reasons. On one hand, the low addition of graphene in the matrix traceable to its poor dispersibility limits the further strength improvement. On the other hand, the introduced graphene tends to distribute into grain boundaries rather than inside grains, which would result in stress concentrations at grain boundaries and localized strains, leading to the poor ductility of graphene/Al composites. In this work, intragranular nano-sized graphene nanoplates with high-content were dispersed in the matrix uniformly by a modified ball milling strategy, which induces that the strength and uniform elongation of the composites were simultaneously enhanced due to the improved work hardenability. Furthermore, the strengthening and toughening mechanisms were also discussed. This work offers a new insight into the fabrication and design of graphene/Al composites with both high strength and ductility.

对于石墨烯增强的铝基复合材料而言，同时获得高强度和延展性是一个关键问题，由于以下原因，常规的机械研磨-粉末冶金技术无法解决该问题。一方面，可归因于其分散性差的基质中石墨烯的低添加限制了强度的进一步提高。另一方面，引入的石墨烯倾向于分布在晶粒边界而不是晶粒内部，这将导致应力集中在晶粒边界和局部应变，导致石墨烯/ Al复合材料的延展性差。在这项工作中，通过改进的球磨策略，将高含量的颗粒内纳米级石墨烯纳米板均匀分散在基质中，这归因于由于提高的加工硬化性，同时提高了复合材料的强度和均匀伸长率。此外，还讨论了强化和增韧机制。这项工作为具有高强度和延展性的石墨烯/ Al复合材料的制造和设计提供了新的见识。