碳纳米管和石墨烯增强铝基复合材料纳米压痕分子动力学模拟  

Molecular Dynamics Simulation of the Nanoindentation of Carbon Nanotubes and Graphene-reinforced Aluminium Matrix Composites

作　　者：舒巧囡 贾振东 曹遴 李金山[1] 陈彪 SHU Qiaonan;JIA Zhendong;CAO Lin;LI Jinshan;CHEN Biao(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《铸造技术》2024年第12期1117-1124,共8页Foundry Technology

基　　金：国家自然科学基金(52071269,52471163,U2067217);广西重点研发计划(AB23026138)。

摘　　要：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.

关 键 词：碳纳米管 石墨烯 铝基复合材料 分子动力学模拟 纳米压痕 

分 类 号：TG146.2[一般工业技术—材料科学与工程]