Strengthening behavior of carbon nanotube-graphene hybrids in copper matrix composites
Strengthening behavior of carbon nanotube-graphene hybrids in copper matrix composites
复制标题
碳纳米管-石墨烯杂化物在铜基复合材料中的强化行为
DOI：
10.1016/j.msea.2018.02.006
复制
发表时间：
2018-03-07
期刊：
影响因子：
6.4
通讯作者：
Bao, Rui
中科院分区：
文献类型：
--
作者：
Chen, Xiaofeng;Tao, Jingmei;Bao, Rui
为发展先进的金属基复合材料(MMCs)，探索了独特的增强结构。本研究采用粉末冶金法制备了具有网状结构的碳纳米颗粒增强铜基复合材料。研究发现，碳纳米管(CNTs)和还原石墨烯氧化物(RGO)的杂化增强效果显著。拉伸试验结果表明，当CNT-RGO杂化材料的体积分数为1.5%时，铜基复合材料的极限拉伸强度接近409 Mpa，显著高于单独添加CNT和RGO的铜基复合材料的极限拉伸强度(分别接近226和259 Mpa)。讨论了碳纳米管-RGO杂化材料的强化机制，包括晶粒细化、热失配产生位错、载荷转移和Orowan环系统等，以了解碳纳米管-RGO杂化材料在复合材料中的强化行为。这项工作强调了增强体的相互连接结构对提高复合材料力学性能的重要性，并为理解网状增强体在复合材料中的增强行为提供了一个新的视角。
Unique architecture of reinforcement is explored for developing advanced metal matrix composites (MMCs). In the present study, Cu matrix composites reinforced by carbon nanofillers with reticulate structure were prepared by powder metallurgy. It was found that the high-efficiency strengthening effect was achieved by employing the hybrids of carbon nanotubes (CNTs) and reduced graphene oxide (RGO) as reinforcements in the Cu matrix. The tensile test results showed that the ultimate tensile strength of similar to 409 MPa was achieved in Cu matrix composite with 1.5 vol% of CNT-RGO hybrids, which is significantly higher than that reinforced with individual CNTs or RGO (similar to 226 and similar to 259 MPa, respectively). Strengthening mechanisms including grain refinement, generation of dislocations by thermal mismatch, load transfer and Orowan looping system were discussed to understand the strengthening behaviors of CNT-RGO hybrids in MMCs. This work underscores the importance of interconnected architecture of reinforcements for improving mechanical properties of the composites and provides an insight to understand the strengthening behaviors of reticulate reinforcements in the composites.