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<p>This study investigates the tensile properties and high-temperature wear behavior of laser-directed energy deposition (LDED) prepared CoCrFe<sub>0.5</sub>Ni<sub>1.5</sub>Nb<sub>0.2</sub> high-entropy alloy (HEA). Molecular dynamics simulations reveal Shockley dislocations dominate the deformation mechanism during stretching. Experiments demonstrate outstanding room temperature mechanical properties: 746.6 MPa tensile strength and 28.9% elongation. At 800°C, the alloy shows superior wear resistance with low friction coefficient (0.47) and wear rate (13.4 × 10<sup>–6</sup>&#xa0;mm<sup>3</sup>/N·m), attributed to high-temperature oxide layer formation. The combined atomic-scale simulation and experimental analysis provide fundamental insights for applying HEAs in high-temperature tribological environments, highlighting their potential for extreme condition engineering applications.</p> Graphical Abstract <p></p>

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Investigation on tensile properties and high-temperature tribological behavior of CoCrFe0.5Ni1.5Nb0.2 high-entropy alloy fabricated by laser-directed energy deposition

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Jing Chen,
  • Tianhai Liao,
  • Qibin Liu

摘要

This study investigates the tensile properties and high-temperature wear behavior of laser-directed energy deposition (LDED) prepared CoCrFe0.5Ni1.5Nb0.2 high-entropy alloy (HEA). Molecular dynamics simulations reveal Shockley dislocations dominate the deformation mechanism during stretching. Experiments demonstrate outstanding room temperature mechanical properties: 746.6 MPa tensile strength and 28.9% elongation. At 800°C, the alloy shows superior wear resistance with low friction coefficient (0.47) and wear rate (13.4 × 10–6 mm3/N·m), attributed to high-temperature oxide layer formation. The combined atomic-scale simulation and experimental analysis provide fundamental insights for applying HEAs in high-temperature tribological environments, highlighting their potential for extreme condition engineering applications.

Graphical Abstract