Huang Jingtao, Li Mingwei, Chen Jiaying, Cheng Yuan, Lai Zhonghong, Hu Jin, Zhou Fei, Qu Nan, Liu Yong, Zhu Jingchuan
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2023 Mar 29;16(7):2722. doi: 10.3390/ma16072722.
Graphene has become an ideal reinforcement for reinforced metal matrix composites due to its excellent mechanical properties. However, the theory of graphene reinforcement in graphene/aluminum matrix composites is not yet well developed. In this paper, the effect of different temperatures on the mechanical properties of the metal matrix is investigated using a classical molecular dynamics approach, and the effects of the configuration and distribution of graphene in the metal matrix on the mechanical properties of the composites are also described in detail. It is shown that in the case of a monolayer graphene-reinforced aluminum matrix, the simulated stretching process does not break the graphene as the strain increases, but rather, the graphene and the aluminum matrix have a shearing behavior, and thus, the graphene "pulls out" from the aluminum matrix. In the parallel stretching direction, the tensile stress tends to increase with the increase of the graphene area ratio. In the vertical stretching direction, the tensile stress tends to decrease as the percentage of graphene area increases. In the parallel stretching direction, the tensile stress of the system tends to decrease as the angle between graphene and the stretching direction increases. It is important to investigate the effect of a different graphene distribution in the aluminum matrix on the mechanical properties of the composites for the design of high-strength graphene/metal matrix composites.
由于其优异的力学性能，石墨烯已成为增强金属基复合材料的理想增强体。然而，石墨烯/铝基复合材料中石墨烯增强的理论尚未得到充分发展。本文采用经典分子动力学方法研究了不同温度对金属基体力学性能的影响，并详细描述了石墨烯在金属基体中的构型和分布对复合材料力学性能的影响。结果表明，在单层石墨烯增强铝基的情况下，模拟拉伸过程中，随着应变增加，石墨烯不会断裂，而是石墨烯与铝基体发生剪切行为，从而使石墨烯从铝基体中“拔出”。在平行拉伸方向上，拉伸应力倾向于随着石墨烯面积比的增加而增大。在垂直拉伸方向上，拉伸应力倾向于随着石墨烯面积百分比的增加而减小。在平行拉伸方向上，随着石墨烯与拉伸方向夹角的增大，体系的拉伸应力倾向于减小。研究铝基体中不同石墨烯分布对复合材料力学性能的影响对于设计高强度石墨烯/金属基复合材料具有重要意义。
