The effect of graphene nanoplatelets on the aging precipitation behavior and mechanical properties of magnesium matrix composite

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-10 DOI:10.1016/j.jallcom.2024.177498

Mu-yuan Li, Xue-jian Li, Hai-long Shi, Wen-qi Xu, Fang-han Chi, Xiao-shi Hu, Chao Xu, Guo-hua Fan, Xiao-jun Wang

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Abstract

Aging can effectively improve the mechanical properties of Mg alloys. The reinforcements can affect the aging kinetics of composites through interaction with the matrix. In this study, the effect of graphene nanoplatelets (GNPs) on the precipitation behavior of Mg-6Zn/GNPs composite was studied. The local region with high GNPs content exhibits a faster aging precipitation rate. Compared with Mg-6Zn alloy, the aging precipitation process of the composites has been accelerated as a whole. It is mainly attributed to the fact that the high density of dislocation near GNPs provides a high-speed channel between nucleation points and atoms for aging precipitation, which promotes aging precipitation. The strengthening effect of the composites mainly results from Orowan strengthening and fine grain strengthening generated by Mg₄Zn₇ and GNPs, respectively. The existence of GNPs enhances the aging hardening efficiency of the composites to a greater extent than that of the alloy matrix. This work provides a new approach for the design of aging behavior in magnesium matrix composites.

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石墨烯纳米片对镁基复合材料老化沉淀行为和力学性能的影响

老化可有效改善镁合金的机械性能。增强材料会通过与基体的相互作用影响复合材料的老化动力学。本研究研究了石墨烯纳米片（GNPs）对 Mg-6Zn/GNPs 复合材料沉淀行为的影响。GNPs 含量高的局部区域表现出更快的老化析出速率。与 Mg-6Zn 合金相比，复合材料的老化析出过程整体上加快了。这主要是由于 GNPs 附近的高密度位错为时效析出提供了成核点与原子之间的高速通道，从而促进了时效析出。复合材料的强化效应主要来自 Mg4Zn7 和 GNPs 分别产生的奥罗旺强化和细晶粒强化。与合金基体相比，GNPs 的存在在更大程度上提高了复合材料的时效硬化效率。这项研究为镁基复合材料的老化行为设计提供了一种新方法。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.