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<p>To address the low hardness and poor wear resistance of niobium (Nb) in practical applications, a Hf<sub>0.1</sub>Nb<sub>1.6</sub>Mo<sub>0.3</sub>Ta<sub>0.12</sub>C<sub>0.12</sub> medium-entropy Nb-based coating was fabricated via laser metal deposition (LMD). The coating’s microstructure and tribological properties were systematically characterized. The coating exhibits a dense, defect-free microstructure with a strong metallurgical bond to the substrate. It primarily consists of a BCC phase with finely dispersed FCC-structured carbides. The microhardness reaches 365.26 HV<sub>0.2</sub>, 3.14 times that of Nb. At room temperature, the wear rate decreases by 14.46%, with adhesive and abrasive wear as dominant mechanisms. At 500°C, the wear rate reduction reaches 94.7%, with oxidative wear and slight adhesive wear. The Hf<sub>0.1</sub>Nb<sub>1.6</sub>Mo<sub>0.3</sub>Ta<sub>0.12</sub>C<sub>0.12</sub> coating demonstrates excellent wear resistance from room temperature to 500°C, attributed to solid solution and precipitation strengthening. Further optimization of precipitate phases could enhance their hardness and wear resistance.</p>

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Microstructure and Tribological Properties of Hf0.1Nb1.6Mo0.3Ta0.12C0.12 Medium-Entropy Niobium-Based Coating by Laser Metal Deposition

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Tong Sun,
  • Jinxiang Fang,
  • Haotian He,
  • Zhi Yang,
  • Biao Ma,
  • Haoteng Chen,
  • Peng He,
  • Yujiang Wang

摘要

To address the low hardness and poor wear resistance of niobium (Nb) in practical applications, a Hf0.1Nb1.6Mo0.3Ta0.12C0.12 medium-entropy Nb-based coating was fabricated via laser metal deposition (LMD). The coating’s microstructure and tribological properties were systematically characterized. The coating exhibits a dense, defect-free microstructure with a strong metallurgical bond to the substrate. It primarily consists of a BCC phase with finely dispersed FCC-structured carbides. The microhardness reaches 365.26 HV0.2, 3.14 times that of Nb. At room temperature, the wear rate decreases by 14.46%, with adhesive and abrasive wear as dominant mechanisms. At 500°C, the wear rate reduction reaches 94.7%, with oxidative wear and slight adhesive wear. The Hf0.1Nb1.6Mo0.3Ta0.12C0.12 coating demonstrates excellent wear resistance from room temperature to 500°C, attributed to solid solution and precipitation strengthening. Further optimization of precipitate phases could enhance their hardness and wear resistance.