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<p>To meet stringent requirements of materials for high-temperature friction conditions in aerospace and other fields, this study systematically investigates the influence of Al addition on the microstructure and high-temperature tribological properties of TiZrNbTaMo-based refractory high-entropy alloys (RHEAs). The results show that the alloy exhibits a single BCC phase when the Al content is less than 10 at.%, while B2 phase and Al<sub>2</sub>Zr<sub>3</sub> intermetallic compounds precipitate when the Al content exceeds 10 at.%. Benefiting from the combined effects of solid solution strengthening and second-phase strengthening, the hardness of the alloy increases linearly with Al content (from 330.56 to 540.79&#xa0;HV). In terms of tribological behavior, the wear rate increases with temperature in the range of 25–500&#xa0;°C, but decreases significantly when the temperature rises from 500 to 700&#xa0;°C. The improvement of wear-resistance is attributed to the self-lubricating effect and the improvement of hardness caused by the Al addition at high temperatures. This research provides a theoretical basis for the design of refractory high-entropy alloys with excellent high-temperature wear resistance.</p>

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Influence of Al Addition on High-Temperature Tribological Properties of TiZrNbTaMo-Based Refractory High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Zhong Liqiong,
  • Xiao Qiang,
  • Zhou Dakui,
  • Lai Weiji,
  • Yi Yanliang

摘要

To meet stringent requirements of materials for high-temperature friction conditions in aerospace and other fields, this study systematically investigates the influence of Al addition on the microstructure and high-temperature tribological properties of TiZrNbTaMo-based refractory high-entropy alloys (RHEAs). The results show that the alloy exhibits a single BCC phase when the Al content is less than 10 at.%, while B2 phase and Al2Zr3 intermetallic compounds precipitate when the Al content exceeds 10 at.%. Benefiting from the combined effects of solid solution strengthening and second-phase strengthening, the hardness of the alloy increases linearly with Al content (from 330.56 to 540.79 HV). In terms of tribological behavior, the wear rate increases with temperature in the range of 25–500 °C, but decreases significantly when the temperature rises from 500 to 700 °C. The improvement of wear-resistance is attributed to the self-lubricating effect and the improvement of hardness caused by the Al addition at high temperatures. This research provides a theoretical basis for the design of refractory high-entropy alloys with excellent high-temperature wear resistance.