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<p>WC/HEA cemented carbides with CoCrFeNiTi HEA as the binder phase were prepared by a low-pressure sintering method after mechanical alloying. The effects of HEA and fine WC content on the microstructure and mechanical properties of WC/HEA cemented carbides were investigated. It is found that the diffusion retardation effect of HEA effectively refined the WC grains, but excessive HEA resulted in the formation of a dendritic structure, causing an uneven microstructure. When the HEA content was 10%, WC/HEA cemented carbide achieved optimum overall performance with a hardness of 1785&#xa0;HV<sub>30</sub>, flexural strength of 863&#xa0;MPa, and fracture toughness of 8.6&#xa0;MPa&#xa0;m<sup>1/2</sup>. Incorporating an appropriate amount of fine WC reduced alloy porosity, facilitating stable columnar-shaped WC grain development. The inclusion of fine WC boosted the dissolution and reprecipitation of WC grains in the HEA binder phase. Moreover, it reduced the presence of free carbon elements that disturb carbon balance while significantly increasing flexural strength. When the fine WC content reached 15%, it exhibited maximum flexural strength which was 23% higher than that without fine WC in the composition. It can be summarized that high hardness and strong flexural strength can be obtained by adding fine WC to WC/HEA cemented carbide with CoCrFeNiTi high-entropy alloy as the binder. This study explores the feasibility of CoCrFeNiTi HEA as binder and provides new ideas for the design of WC/HEA cemented carbide.</p>

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Effects of High-Entropy Alloy and Fine WC on Microstructure and Properties of WC/CoCrFeNiTi Cemented Carbide

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Junning Huai,
  • Jin Du,
  • Yujing Sun,
  • Yan Xia,
  • Peirong Zhang,
  • Guosheng Su,
  • Yinling Li,
  • Haichuan Shi,
  • Jincheng Huang

摘要

WC/HEA cemented carbides with CoCrFeNiTi HEA as the binder phase were prepared by a low-pressure sintering method after mechanical alloying. The effects of HEA and fine WC content on the microstructure and mechanical properties of WC/HEA cemented carbides were investigated. It is found that the diffusion retardation effect of HEA effectively refined the WC grains, but excessive HEA resulted in the formation of a dendritic structure, causing an uneven microstructure. When the HEA content was 10%, WC/HEA cemented carbide achieved optimum overall performance with a hardness of 1785 HV30, flexural strength of 863 MPa, and fracture toughness of 8.6 MPa m1/2. Incorporating an appropriate amount of fine WC reduced alloy porosity, facilitating stable columnar-shaped WC grain development. The inclusion of fine WC boosted the dissolution and reprecipitation of WC grains in the HEA binder phase. Moreover, it reduced the presence of free carbon elements that disturb carbon balance while significantly increasing flexural strength. When the fine WC content reached 15%, it exhibited maximum flexural strength which was 23% higher than that without fine WC in the composition. It can be summarized that high hardness and strong flexural strength can be obtained by adding fine WC to WC/HEA cemented carbide with CoCrFeNiTi high-entropy alloy as the binder. This study explores the feasibility of CoCrFeNiTi HEA as binder and provides new ideas for the design of WC/HEA cemented carbide.