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<p>This study investigates the anisotropic thermal conductivity of aluminum matrix composites reinforced with graphene nanoplates (GNPs) and <i>in situ</i> ZrB<sub>2</sub> nanoparticles, while simultaneously maintaining high strength and toughness. A discontinuous layered GNPs–ZrB<sub>2</sub>/AA6111 composite was prepared using <i>in situ</i> melt reactions and semi-solid stirring casting technology, combined with hot rolling deformation processing. Microstructural analysis revealed that the GNPs were aligned parallel to the rolling direction–transverse direction (RD–TD) plane, whereas the ZrB<sub>2</sub> nanoparticles aggregated into cluster strips, collectively forming a discontinuous layered structure. This multilayer arrangement maximized the in-plane thermal conductivity of the GNPs. The tightly bonded GNP/Al interfaces with the locking of CuAl<sub>2</sub> nanoparticles ensured that the GNPs fully exploited their high thermal conductivity. Therefore, the GNPs–ZrB<sub>2</sub>/AA6111 composite achieved high in-plane thermal conductivity (230 W/(m·K)), which is higher than that of the matrix (206 W/(m·K)). The improved in-plane thermal conductivity is primarily attributed to the exceptionally high intrinsic in-plane thermal conductivity of the GNPs and their two-dimensional layered structure. However, the composite exhibited pronounced thermal conductivity anisotropy in the in-plane and through-plane directions. The reduced through-plane thermal conductivity is predominantly caused by the intrinsically low through-plane thermal conductivity of the GNPs and the increased interfacial thermal resistance from the additional grain boundaries.</p>

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Anisotropic thermal conductivity of aluminum matrix composites reinforced by graphene nanoplates and ZrB2 nanoparticles

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Chuang Guan,
  • Xizhou Kai,
  • Wei Qian,
  • Ran Tao,
  • Gang Chen,
  • Yutao Zhao

摘要

This study investigates the anisotropic thermal conductivity of aluminum matrix composites reinforced with graphene nanoplates (GNPs) and in situ ZrB2 nanoparticles, while simultaneously maintaining high strength and toughness. A discontinuous layered GNPs–ZrB2/AA6111 composite was prepared using in situ melt reactions and semi-solid stirring casting technology, combined with hot rolling deformation processing. Microstructural analysis revealed that the GNPs were aligned parallel to the rolling direction–transverse direction (RD–TD) plane, whereas the ZrB2 nanoparticles aggregated into cluster strips, collectively forming a discontinuous layered structure. This multilayer arrangement maximized the in-plane thermal conductivity of the GNPs. The tightly bonded GNP/Al interfaces with the locking of CuAl2 nanoparticles ensured that the GNPs fully exploited their high thermal conductivity. Therefore, the GNPs–ZrB2/AA6111 composite achieved high in-plane thermal conductivity (230 W/(m·K)), which is higher than that of the matrix (206 W/(m·K)). The improved in-plane thermal conductivity is primarily attributed to the exceptionally high intrinsic in-plane thermal conductivity of the GNPs and their two-dimensional layered structure. However, the composite exhibited pronounced thermal conductivity anisotropy in the in-plane and through-plane directions. The reduced through-plane thermal conductivity is predominantly caused by the intrinsically low through-plane thermal conductivity of the GNPs and the increased interfacial thermal resistance from the additional grain boundaries.