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<p>In this study, a novel high-entropy boride (HEB)-based cermet with the nominal composition of (Mo,W)<sub>2</sub>(Fe,Co,Ni)B<sub>2</sub>-(Fe,Co,Ni) was prepared via reaction boronizing sintering. The metallurgical mechanism, interfacial structure, and the fabrication processing were systematically studied. With the increase of sintering temperature, raw powders first formed simple binary borides (Fe,Co,Ni)<sub>2</sub>B, and then W, Mo would&#xa0;diffuse to binary borides to form ternary borides. When the temperature continued to rise to more than 1250 °C, the cermet consisted mainly of orthorhombic-(Mo,W)<sub>2</sub>(Fe,Co,Ni)B<sub>2</sub> phase and cubic-(Fe,Co,Ni) phase. The interfaces of the cermet were studied by transmission electron microscopy (TEM), and the results showed that the hard phase and binder phase interface exhibited good coherence. In addition, a systematic study and optimization were conducted on the sintering process and the amount of C added. The results showed that when the binder phase content was 18.5 wt% and C content was 0.3 wt% and sintered at 1310 °C for 40&#xa0;min, the cermet exhibited the optimal mechanical properties, with a TRS of 1688.5&#xa0;MPa and an HRA of 84.7. This study provides a valuable contribution to the development and industrial application of HEBs.</p>

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Preparation and mechanical properties of high-entropy boride-based cermet based on ternary boride

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Dongyu Shangguan,
  • Huabo Lang,
  • Shunfeng Tang,
  • Xiaoqin Wang,
  • Xianquan Jiang,
  • Guangrui Wang,
  • Jie Wang

摘要

In this study, a novel high-entropy boride (HEB)-based cermet with the nominal composition of (Mo,W)2(Fe,Co,Ni)B2-(Fe,Co,Ni) was prepared via reaction boronizing sintering. The metallurgical mechanism, interfacial structure, and the fabrication processing were systematically studied. With the increase of sintering temperature, raw powders first formed simple binary borides (Fe,Co,Ni)2B, and then W, Mo would diffuse to binary borides to form ternary borides. When the temperature continued to rise to more than 1250 °C, the cermet consisted mainly of orthorhombic-(Mo,W)2(Fe,Co,Ni)B2 phase and cubic-(Fe,Co,Ni) phase. The interfaces of the cermet were studied by transmission electron microscopy (TEM), and the results showed that the hard phase and binder phase interface exhibited good coherence. In addition, a systematic study and optimization were conducted on the sintering process and the amount of C added. The results showed that when the binder phase content was 18.5 wt% and C content was 0.3 wt% and sintered at 1310 °C for 40 min, the cermet exhibited the optimal mechanical properties, with a TRS of 1688.5 MPa and an HRA of 84.7. This study provides a valuable contribution to the development and industrial application of HEBs.