Fabrication and Characterization of Functionally Graded Nanocomposites: Impact of Graphene and Vanadium Carbide on Aluminum Matrix

Essam B. Moustafa, Mohamed Said, Abdulrahman Aljabri, Mohammed A. Taha, Rasha Youness, Hossameldin Hussein
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Abstract

Functional graded nanocomposites (FGNCs) based on Al are artificially tailored heterogeneous materials intended to serve the demand for diverse and contradicting properties used in various industrial applications. FGNCs and hybrid FGNCs (HFGNCs) based on Al reinforced with graphene and vanadium carbide (VC) were prepared using powder metallurgy techniques and investigated. Both samples were designed with a gradient composition, where the bottom layer consisted of 100% pure Al, followed by three consecutive layers containing progressively increasing amounts of reinforcement. The incorporation of graphene and VC into layer powders resulted in a decrease in both particle and crystal dimensions compared to pure Al. Adding graphene has a negative effect on bulk density samples, while VC has a positive effect. Reinforcing materials led to a decrease in thermal conductivity that reached 26.7 % for samples reinforced with VC reinforcement, except for FGNCs reinforced with graphene, which increased by ~3.3 compared to Al. The samples’ CTE and electrical conductivity values decreased, although adding graphene alone led to a slight decrease in electrical conductivity. A significant improvement in all mechanical properties was noted with additional. The HFGCNs reinforced with the largest amount of hybrid reinforcement recorded an improvement in CTE value, Young's modulus, and compressive strength by about 38.1%, 22.2%, and 20.5%, respectively, compared to Al
功能分级纳米复合材料的制备与表征:石墨烯和碳化钒对铝基体的影响
基于铝的功能分级纳米复合材料(FGNCs)是一种人工定制的异质材料,旨在满足各种工业应用对多样化和相互矛盾特性的需求。我们采用粉末冶金技术制备并研究了以石墨烯和碳化钒(VC)增强的铝为基础的 FGNCs 和混合 FGNCs(HFGNCs)。这两种样品均采用梯度成分设计,即底层由 100% 的纯铝组成,然后连续三层含有逐渐增加的增强成分。与纯铝相比,在层粉末中加入石墨烯和 VC 会导致颗粒和晶体尺寸减小。添加石墨烯对体积密度样品有负面影响,而添加 VC 则有正面影响。增强材料导致热导率降低,使用 VC 增强材料的样品热导率降低了 26.7%,但使用石墨烯增强的 FGNC 除外,其热导率比纯铝增加了约 3.3%。虽然单独添加石墨烯会导致导电率略有下降,但样品的 CTE 值和导电率都有所下降。添加石墨烯后,所有机械性能都有明显改善。与铝相比,添加了最大量混合增强材料的 HFGCN 的 CTE 值、杨氏模量和抗压强度分别提高了约 38.1%、22.2% 和 20.5%。
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