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<p>The available research on HEA particle-reinforced metal matrix composites showed that the diffusion layer structure was easy to produce between the interface of HEA and metal matrix. However, the effect of this structure on the properties of the composite is controversial. In this paper, HEA particle-reinforced Cu matrix composites were prepared by FSP. The diffused layer structures with different widths were obtained by different heat treatment time. The effects of heat treatment time on the Cu matrix, HEA and structure of diffusion layer, and the mechanical properties of composites with different widths of diffusion layer were investigated. The results showed that the diffusion layer was mainly composed of Cu-rich phase and Fe-Co-Cr phase with face-centered cubic structure. The width of diffusion layer increased with the increase of heat treatment time. The average grain size after heat treatment is maintained between 7 and 7.5&#xa0;μm. The extension of heat treatment time did not lead to the further increase of grain size. The average microhardness of the composite was about 112 HV. With the increase of heat treatment time, the hardness of HEA particles in the composite increases first and subsequently decreases. When the heat treatment time was 0.5&#xa0;h, the hardness value was the highest, which is 4.2&#xa0;GPa. The elongation of the composite was increased from 28%(0.5&#xa0;h) to 34%(6&#xa0;h). The strength of all the samples was higher than that of pure copper. </p>

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Effect of Interfacial Diffusion Layer on Microstructure and Properties of High-Entropy Alloy Particle-Reinforced Cu Matrix Composites Prepared By Friction Stir Processing

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Rui Zhu,
  • Yumeng Sun,
  • Jiacheng Feng,
  • Yupeng Li,
  • Wei Liu,
  • Wenbiao Gong

摘要

The available research on HEA particle-reinforced metal matrix composites showed that the diffusion layer structure was easy to produce between the interface of HEA and metal matrix. However, the effect of this structure on the properties of the composite is controversial. In this paper, HEA particle-reinforced Cu matrix composites were prepared by FSP. The diffused layer structures with different widths were obtained by different heat treatment time. The effects of heat treatment time on the Cu matrix, HEA and structure of diffusion layer, and the mechanical properties of composites with different widths of diffusion layer were investigated. The results showed that the diffusion layer was mainly composed of Cu-rich phase and Fe-Co-Cr phase with face-centered cubic structure. The width of diffusion layer increased with the increase of heat treatment time. The average grain size after heat treatment is maintained between 7 and 7.5 μm. The extension of heat treatment time did not lead to the further increase of grain size. The average microhardness of the composite was about 112 HV. With the increase of heat treatment time, the hardness of HEA particles in the composite increases first and subsequently decreases. When the heat treatment time was 0.5 h, the hardness value was the highest, which is 4.2 GPa. The elongation of the composite was increased from 28%(0.5 h) to 34%(6 h). The strength of all the samples was higher than that of pure copper.