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石墨烯/铜复合材料剪切性能的分子动力学模拟 被引量:9
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作者 华军 宋郴 +1 位作者 段志荣 肖攀 《复合材料学报》 EI CAS CSCD 北大核心 2018年第3期632-639,共8页
采用分子动力学方法系统地研究了石墨烯/铜复合材料的剪切力学性能,包括剪切弹性模量、剪切屈服强度、剪切破坏强度及剪切变形机制。研究发现,与单晶铜的剪切模拟相比较,石墨烯的加入显著增强了石墨烯/铜复合材料的剪切强度,并且剪切强... 采用分子动力学方法系统地研究了石墨烯/铜复合材料的剪切力学性能,包括剪切弹性模量、剪切屈服强度、剪切破坏强度及剪切变形机制。研究发现,与单晶铜的剪切模拟相比较,石墨烯的加入显著增强了石墨烯/铜复合材料的剪切强度,并且剪切强度随着石墨烯体积分数的增大而提高。复合材料中的石墨烯层与铜层产生了协同作用,即石墨烯层阻碍了铜的位错扩展,铜层限制了石墨烯的结构屈曲。对含球形缺陷的石墨烯/铜复合材料的剪切性能也进行了研究。结果表明,不同位置和数量的球形小缺陷对复合材料的剪切性能影响不大,小缺陷石墨烯/铜复合材料仍具有较好的性能和使用价值。但随着缺陷直径的增大,复合材料的剪切强度明显减小。 展开更多
关键词 石墨烯/铜复合材料 分子动力学 剪切 缺陷 位错
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Microstructures and interfacial interactions of Al_(2)O_(3)whiskers and graphene nano-platelets co-reinforced copper matrix composites
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作者 Zhen-yi SHAO Heng-kang PAN +2 位作者 Rui SHU Xiao-song JIANG Min-hao ZHU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第9期2935-2947,共13页
The mechanical properties and microstructures of Al_(2)O_(3)whiskers and graphene nano-platelets(GNPs)co-reinforced Cu-matrix composites were studied.Cu-matrix composites with a variation of GNPs amount were fabricate... The mechanical properties and microstructures of Al_(2)O_(3)whiskers and graphene nano-platelets(GNPs)co-reinforced Cu-matrix composites were studied.Cu-matrix composites with a variation of GNPs amount were fabricated by mechanical alloying followed by vacuum hot-pressing sintering and hot isostatic pressing.The Cu-matrix composite with 0.5 wt.%GNPs(GNPs-0.5)suggests a good interfacial bonding of both Cu/C and Cu/Al_(2)O_(3)interfaces.Both the hardness and compressive strength of Cu-matrix composites show a consistent tendency that firstly increases to a critical value and then decreases with increasing GNPs amount.It is suggested that the most possible strengthening mechanisms of both GNPs and Al_(2)O_(3)whisker working in the Cu-matrix composites involve energy dissipating and load transfer,as well as grain refinements for GNPs.The synergetic effect of GNPs and Al_(2)O_(3)whiskers is highlighted that the embedded GNPs would hinder the crack path generated at the Al_(2)O_(3)/Cu interface and enhance the already outstanding strengthening effect that Al_(2)O_(3)whiskers provide. 展开更多
关键词 GRAPHENE Al_(2)O_(3)whisker Cu-matrix composite microstructure interfacial interaction
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