Effect of graphene coating on indentation properties of aluminum matrix
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摘要: 石墨烯作为一种新型增强材料，在增强金属的力学性能方面有广阔的应用前景。利用分子动力学模拟，计算了单晶铝(Al)及单、双层石墨烯涂层铝(Gr/Al)的纳米压痕响应。研究了Al和Gr/Al在球形压头下的压痕性能，并对其压痕力学行为进行分析，以探究压痕作用下Gr涂层对Al基体性能的影响。结果表明，Gr涂层显著增强了Al基体的承载能力，并且提高了其硬度和折合弹性模量。通过分析材料变形行为、内部应力及位错扩展发现，Gr提高Al基体压痕性能的原因主要有两个：一是Al基体在Gr涂层的“托举作用”下承载面积的大幅增加；二是Gr涂层改变了Al基体中位错的扩展。通过对比单、双层Gr涂层下Al基体的压痕性能，发现增加Gr层数可以提高整个系统的承载能力，但减小了系统的临界压深。Abstract: Graphene, as a new type of reinforcement material, has a wide application prospect in strengthening the mechanical properties of metals. The indentation response of single crystal aluminum (Al) and aluminum coated by single or double-layer graphene (Gr/Al) was calculated by molecular dynamics method. The indentation properties of Al and Gr/Al under the spherical indenter were studied, and the indentation mechanical behaviors were analyzed to investigate the influence of Gr coating on Al matrix properties under indentation. The results show that the Gr coating can significantly enhance the bearing capacity of Al matrix, and improve the hardness and reduced elastic modulus of Al matrix. Through the analysis of deformation behavior, internal stress and dislocation expansion, it is found that there are two main reasons for Gr to improve the indentation performance of Al matrix: one is the increase of bearing area of Al matrix under the "lifting action" of Gr coating. The second is that Gr coating changes the dislocation expansion in Al matrix. By comparing the indentation properties of Al matrix under single and double Gr coating, it is found that increasing Gr layer number can improve the bearing capacity of the whole system, but reduce the critical depth of the system.
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Key words:
- graphene/aluminum composites /
- molecular dynamics /
- indentation /
- coating /
- dislocation
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图 1 单晶铝(Al)及石墨烯涂层单晶铝(Gr/Al)压痕模型
Figure 1. Indentation models of single crystal aluminum (Al) and graphene coated single crystal aluminum (Gr/Al)
图 2 Al和Gr/Al压痕荷载-位移曲线
Figure 2. Load-displacement curves of Al and Gr/Al indentation
Gr—Single or double-layer graphene
图 3 Al基体((a)~(d))和Gr/Al基体((e)~(h))在不同压深时的应力分布
Figure 3. Stress distribution of Al matrix ((a)-(d)) and Gr / Al matrix ((e)-(h)) at different indentation depths
D—Displacement
图 4 Gr破裂前后Gr和Gr/Al基体z方向应力状态
Figure 4. Stress state of Gr and Gr/Al matrix in z direction of pre/post Gr broken
图 5 Al和Gr/Al在压痕深度D=3.5 nm时的剖面图和俯视图
Figure 5. Cross section and top view of Al and Gr/Al at indentation depth of D=3.5 nm
L—Bearing diameter; S—Bearing area
图 6 Al ((a)~(c))和Gr/Al ((d)~(f))在不同压深下的位错剖面图及表面形态图
Figure 6. Dislocation profiles and surface morphologies of Al ((a)-(c)) and Gr/Al ((d)-(f)) at different indentation depths
图 7 Al和Gr/Al在D=3.5 nm时的位错剖面
Figure 7. Dislocation profiles of Al and Gr/Al at D=3.5 nm
图 8 单层石墨烯-铝(Gr-1/Al)和双层石墨烯-铝(Gr-2/Al)压痕荷载-位移曲线
Figure 8. Indentation load-displacement curves of monolayer graphene-aluminum (Gr-1/Al) and bilayer graphene-aluminum (Gr-2/Al)
图 9 Gr-1/Al和Gr-2/Al两种体系在D=3.5 nm时的剖面图
Figure 9. Profile of Gr-1/Al和Gr-2/Al two systems at D=3.5 nm
图 10 Al、Gr-1/Al和Gr-2/Al加载-卸载过程荷载-位移曲线
Figure 10. Load-displacement curves of Al, Gr-1/Al and Gr-2/Al in the load-unloading process
图 11 卸载时基体原子对压头的阻碍作用
Figure 11. The hindering effect of matrix atoms on indenter during unloading
图 12 球形压头下纳米压痕材料变形示意图及三种基体的实际压痕接触深度示意图
hc—Actual indentation contact depth; ha—Contact depth change value
Figure 12. Deformation diagram of nanoindentation material under spherical indenter and the diagram of actual indentation contact depth of three kinds of matrix
图 13 三种基体折合弹性模量Er与压痕深度h的变化关系
Figure 13. Relationship between reduced elastic modulus Er and indentation depth h of three kinds of matrix
表 1 Fmax、dP/dh、hc、A、H和Er的数值
Table 1. Values of Fmax、dP/dh、hc、A、H and Er
Type Fmax/nN dP/dh/(nN·nm−1) hc/nm A/nm2 H/GPa Er/GPa Al 94.64 108.27 2.34 29.46 3.21 17.68 Gr-1/Al 533.09 325.53 1.77 22.27 23.94 61.14 Gr-2/Al 781.42 448.42 1.69 21.28 36.73 86.16 Notes：Fmax—Maximum indenter load in indentation stage; dP/dh—Contact stiffness of the material; hc—Catual indentation contact depth; A—Indentation contact area; H—Hardness of material; Er—Modulus of elasticity of the material. 
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