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Strengthening behavior of carbon nanotube-graphene hybrids in copper matrix composites

机译：碳纳米管-石墨烯杂化物在铜基复合材料中的强化行为

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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 ~ 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 (~ 226 and ~ 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.
机译：为了开发先进的金属基复合材料（MMC），探索了独特的增强结构。在本研究中，通过粉末冶金制备了具有网状结构的碳纳米填料增强的铜基复合材料。发现通过将碳纳米管（CNT）和还原性氧化石墨烯（RGO）的杂化物用作Cu基体中的增强剂，可以实现高效率的强化效果。拉伸试验结果表明，具有1.5％（体积）CNT-RGO杂化体的Cu基复合材料的极限拉伸强度达到409 MPa，明显高于单个CNT或RGO增强的复合材料（〜226和〜259 MPa，分别）。讨论了强化机制，包括晶粒细化，热失配产生位错，负载转移和Orowan环化系统，以了解CNT-RGO杂化物在MMC中的强化行为。这项工作强调了增强件的互连结构对于改善复合材料的机械性能的重要性，并为了解复合材料中网状增强件的增强行为提供了见识。

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