首页|Attaining synergetic equilibrium of electrical conductivity and tensile strength in GQDs@GN/Cu composites through multi-scale intragranular and intergranular reinforcements

Attaining synergetic equilibrium of electrical conductivity and tensile strength in GQDs@GN/Cu composites through multi-scale intragranular and intergranular reinforcements

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The configuration and quality of reinforce-ments,as well as the robustness of interfacial bonding,holding a critical significance in determining the concur-rence between electrical conductivity and mechanical strength in metal matrix composites.In this study,citric acid was employed as the precursor for synthesizing multi-scale carbon nanomaterials(graphene quantum dots and graphene,abbreviated as GQDs and GN).The GQDs@GN/Cu composites were fabricated through a segmented ball milling process in conjunction with subsequent spark plasma sintering(SPS).The intragranular GQDs and intergranular GQDs@GN had synergistically reinforced Cu composites through Orowan strengthening,load transfer strengthening and refinement strengthening.Furthermore,the robust interface bonding between GQDs@GN and Cu effectively mitigated interfacial impedance stemming from electron-boundary scattering.The yield strength and ulti-mate tensile strength of the GQDs@GN/Cu composites were recorded as 270 and 314 MPa,respectively,repre-senting an improvement of 92 and 28％over pure Cu,while maintaining electrical conductivity at a level comparable to that of pure Cu.This study advances the understanding of the possibility of realizing a synergistic compatibility between electrical conductivity and mechanical strength in Cu composites.

Cu matrix compositesInterface bondingMechanical propertyGraphene quantum dots(GQDs)Electrical conductivity

Shuang-Yin Zhang、Liang Liu、Rui Bao、Jian-Hong Yi、Sheng-Da Guo

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Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

Key Laboratory of Advanced Materials of Yunnan Province,Kunming University of Science and Technology,Kunming 650093,China

Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScience and Technology Major Project of Yunnan Province

5217434552064032202202AG050004

2024

10.1007/s12598-023-02391-0

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(1)
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