标题： 石墨烯片增强的铝基复合材料通过热累积轧制叠轧提高强度 显示英文标题

标题： Graphene platelets reinforced aluminum matrix composite with enhanced strength by hot accumulative roll bonding

摘要： 累积轧制结合（ARB）工艺被用于开发以片材形式存在的少层石墨烯纳米片增强的铝基（GNPs/Al）复合材料。 退火的铝片在第一和第二道次中与石墨烯涂层一起进行ARB加工，加工次数达到6道次。 另一组样品则在没有石墨烯涂层的情况下，使用相同的工艺参数制备。 根据ARB工艺的薄膜理论分析了这两组样品的性能，该理论能够实现堆叠层界面处材料的微观混合。 因此，通过我们的工艺克服了石墨烯团聚的问题。 对横截面进行了拉曼光谱分析，这不仅显示了由于D带和D'带增强而产生的GNPs与铝基体之间的强烈相互作用，还基于单对称的2D带表明了石墨烯质量的提高。 随后，样品被施加万能试验机（UTM）和维氏显微硬度计进行测试。 结果表明，GNPs/Al基体复合材料的屈服强度提高了约73%，硬度提高了约27%。 为了了解高道次下的断裂力学，进一步在扫描电子显微镜（SEM）下检查了拉伸试样的断口表面，这阐明了堆叠片的延伸率变化和分层行为。 GNPs/Al复合材料中深长的凹坑和光滑表面是延伸率降低的原因。 但最终的复合材料具有较高的强度和可接受的延展性。 通过X射线衍射（XRD）数据计算的位错增加进一步证明了这一改进。 所有结果都表明所提出的技术在开发GNPs/Al复合材料方面的有效性。 显示英文摘要

摘要： Accumulative Roll Bonding(ARB) process was used to develop few-layer graphene nano platelets reinforced aluminum matrix (GNPs/Al) composite in the form of sheets. Annealed Al sheets were ARB processed up to 6 pass along with coating of graphene between stacked sheets in first and second pass. Another set was prepared with same process parameter in the absence of graphene coating. Properties of these two set of samples were analyzed on the basis of film theory of ARB process which enables micro-level mixing of material on stacked layer interface. Hence the problem of graphene agglomeration was overcome through our process. The Raman spectra at the cross-section was taken which not only show the strong interaction of GNPs with Al matrix due to increased D and D' band but also the graphene quality enhancement on the basis of single symmetric 2D band. Samples were then subjected to universal testing machine (UTM) and Vickers microhardness tester. Results showed up to ~73% increment in yield strength and ~27% increment in hardness of GNPs/Al matrix composite. Fracture surface of tensile specimen was further examined under SEM to understand the fracture mechanics at higher passes, which elucidate elongation variation and delamination behavior of stacked sheets. Deep elongated dimples with the smoothed surface in GNPs/Al composite are the cause of reduced elongation. But the final composite was having improved strength with appreciable ductility. The improvement was further justified by increment in dislocations, calculated using Williamson-Hall plot on X-ray diffraction (XRD) data. All results signify the effectiveness of the proposed technique for the development of GNPs/Al composite.