<p>Due to their large specific surface area and strong van der Waals interactions, graphene nanoplatelets (GNPs) tend to agglomerate readily, leading to poor compatibility with the aluminum matrix. This severely reduces their dispersion in the aluminum matrix, thereby compromising the mechanical and corrosion resistance properties of aluminum-based composites. In this study, a high-energy ball-milling method was employed to disperse GNPs and silicon carbide nanowires (SiCnw) within 0.5 h. Surprisingly, Raman spectroscopy revealed significantly improved structural integrity of GNPs compared with previous studies. Consequently, we aimed to fully exploit the synergistic effects of GNPs and SiCnw. The binary SiCnw-GNP hybrid composite combines graphene's solid lubrication properties and silicon carbide's high wear resistance, hardness, and tensile strength, thereby enhancing the mechanical and corrosion resistance of the composite. The research findings indicate that the composite material containing 0.5 wt.% GNPs + 1.0 wt.% SiCnw/2024Al achieved a maximum hardness of 182.6 HV<sub>0.2</sub> and a maximum tensile strength of 551.6&#xa0;MPa after 12 h of aging. GNPs improve the intergranular corrosion resistance of 2024Al; however, with increasing SiCnw content, the corrosion current density of the composite material gradually increases, reducing its corrosion resistance. This provides a reference for balancing the mechanical and corrosion resistance properties of aluminum-based composites.</p>

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Preparation and Properties of Graphene Nanoplatelet (GNP) and Silicon Carbide Nanowire (SiCnw) Hybrid Synergistic Reinforced 2024 Aluminum Matrix Composites

  • Jiayu Liu,
  • Fei Gao,
  • Xiaoyan Liu,
  • Chenyu Li,
  • Peng Tian,
  • Mengyao Gao,
  • Hailong Xie,
  • Chuanzhi Liu

摘要

Due to their large specific surface area and strong van der Waals interactions, graphene nanoplatelets (GNPs) tend to agglomerate readily, leading to poor compatibility with the aluminum matrix. This severely reduces their dispersion in the aluminum matrix, thereby compromising the mechanical and corrosion resistance properties of aluminum-based composites. In this study, a high-energy ball-milling method was employed to disperse GNPs and silicon carbide nanowires (SiCnw) within 0.5 h. Surprisingly, Raman spectroscopy revealed significantly improved structural integrity of GNPs compared with previous studies. Consequently, we aimed to fully exploit the synergistic effects of GNPs and SiCnw. The binary SiCnw-GNP hybrid composite combines graphene's solid lubrication properties and silicon carbide's high wear resistance, hardness, and tensile strength, thereby enhancing the mechanical and corrosion resistance of the composite. The research findings indicate that the composite material containing 0.5 wt.% GNPs + 1.0 wt.% SiCnw/2024Al achieved a maximum hardness of 182.6 HV0.2 and a maximum tensile strength of 551.6 MPa after 12 h of aging. GNPs improve the intergranular corrosion resistance of 2024Al; however, with increasing SiCnw content, the corrosion current density of the composite material gradually increases, reducing its corrosion resistance. This provides a reference for balancing the mechanical and corrosion resistance properties of aluminum-based composites.