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Low-frequency conductivity of low wear high-entropy alloys

Author

Listed:
  • Cheng-Hsien Yeh

    (National Cheng Kung University)

  • Wen-Dung Hsu

    (National Cheng Kung University
    National Cheng Kung University
    National Cheng Kung University)

  • Bernard Haochih Liu

    (National Cheng Kung University
    National Cheng Kung University)

  • Chan-Shan Yang

    (National Cheng Kung University
    National Taiwan Normal University)

  • Chen-Yun Kuan

    (National Cheng Kung University)

  • Yuan-Chun Chang

    (National Cheng Kung University)

  • Kai-Sheng Huang

    (National Cheng Kung University)

  • Song-Syun Jhang

    (National Cheng Kung University)

  • Chia-Yen Lu

    (National Taiwan Normal University)

  • Peter K. Liaw

    (The University of Tennessee)

  • Chuan-Feng Shih

    (National Cheng Kung University
    National Cheng Kung University
    National Cheng Kung University)

Abstract

High-entropy alloys (HEAs) provide new research avenues for alloy combinations in the periodic table, opening numerous possibilities in novel-alloy applications. However, their electrical characteristics have been relatively underexplored. The challenge in establishing an HEA electrical conductivity model lies in the changes in electronic characteristics caused by lattice distortion and complexity of nanostructures. Here we show a low-frequency electrical conductivity model for the Nb-Mo-Ta-W HEA system. The cocktail effect is found to explain trends in electrical-conductivity changes in HEAs, while the magnitude of the reduction is understood by the calculated plasma frequency, free electron density, and measured relaxation time by terahertz spectroscopy. As a result, the refractory HEA Nb15Mo35Ta15W35 thin film exhibits both high hardness and excellent conductivity. This combination of Nb15Mo35Ta15W35 makes it suitable for applications in atomic force microscopy probe coating, significantly improving their wear resistance and atomic-scale image resolution.

Suggested Citation

  • Cheng-Hsien Yeh & Wen-Dung Hsu & Bernard Haochih Liu & Chan-Shan Yang & Chen-Yun Kuan & Yuan-Chun Chang & Kai-Sheng Huang & Song-Syun Jhang & Chia-Yen Lu & Peter K. Liaw & Chuan-Feng Shih, 2024. "Low-frequency conductivity of low wear high-entropy alloys," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49035-0
    DOI: 10.1038/s41467-024-49035-0
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