碳纳米管(CNT)和石墨烯(Gr)分别是一维和二维碳纳米材料的代表，是金属基复合材料(MMCs)中常用的 两种增强材料。 通过对相同结构的CNT和Gr增强铝(Al)基复合材料(即CNT/Al和Gr/Al)的纳米压痕行为进行分子动 力学模拟，探究CNT和Gr对铝基复合材料的抗压增强效果与压痕变形行为。 结果表明，Gr/Al在纳米压痕过程中的塑 性变形量明显小于CNT/Al， 而CNT/Al在压痕深度较大时会出现CNT凹陷行为。 Gr对于位错的阻碍作用明显优于 CNT，且 Gr/Al 中的不可动位错比例随压痕深度增加而增大，能够进一步提高位错强化作用。 因此，Gr/Al的综合抗压性 能和阻碍基体发生较大形变的能力要优于CNT/Al。

 Carbon nanotubes (CNTs) and graphene (Gr), which represent one- and two-dimensional carbon nanomaterials, respectively, are two commonly used reinforcing materials in metal matrix composites (MMCs). In this study, molecular dynamics simulations of the nanoindentation behavior of CNT- and Gr-reinforced aluminium (Al) matrix composites (i.e., CNT/Al and Gr/Al) with the same structures were performed to study the compressive strengthening effect and indentation deformation behavior of CNTs and Gr on aluminium matrix composites. The simulation results show that the plastic deformation of Gr/Al during nanoindentation is significantly smaller than that of CNT/Al, whereas CNT/Al exhibits CNT dents when the indentation depth is larger. The hindering effect of Gr on dislocations is significantly better than that of CNTs, and the proportion of immovable dislocations in Gr/Al increases with increasing indentation depth, which can further improve the dislocation strengthening effect. As a result, the combined compressive properties and the ability to hinder large deformation of the matrix of Gr/Al are superior to those of CNT/Al.