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<p>Equimolar AlCoCrFeNi high-entropy alloy (HEA) constitute a novel class of promising high-temperature structural material, because of its excellent specific strength. Nevertheless, the inferior oxidation properties restrict the application of equimolar AlCoCrFeNi HEA. Herein, we report a novel Y/Sc co-doped AlCoCrFeNi HEA with superior mechanical and oxidation properties. The Y/Sc co-doped AlCoCrFeNi HEA comprises ordered B2 and disordered A2 BCC-structured phases. Y/Sc co-doping increases peak stress from ~ 79.2 ± 0.4 to ~ 81.8 ± 0.3&#xa0;MPa because of solid-solution hardening and fine-grain hardening. The superior oxidation properties of the Y/Sc co-doped AlCoCrFeNi HEA are ascribed to the rapid establishment of a unique <i>α</i>-Al<sub>2</sub>O<sub>3</sub> scale in the early oxidation period and the inhibition of Y/Sc ions on the outward diffused Al at scale grain boundaries in the long-term oxidation period. Moreover, Y/Sc co-doping has a synergistic effect on decreasing the oxidation rate. The influence of single- and co-doping on the oxide grain morphology and oxide growth mechanism is explored in depth. These findings provide a sustainable solution and a new approach to overcoming the looming issue of material deterioration at elevated temperatures.</p>

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Considerable Improvement in the Oxidation Resistance of a Y/Sc Co-doped AlCoCrFeNi High-Entropy Alloy Without Loss of Mechanical Properties at 1100 °C

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • R. R. Chen,
  • H. Ren,
  • D. Z. Chen,
  • X. F. Gao,
  • T. Liu,
  • X. Yang,
  • L. Feng,
  • Y. Chen,
  • G. Qin,
  • S. P. Wu,
  • J. J. Guo,
  • H. Z. Fu

摘要

Equimolar AlCoCrFeNi high-entropy alloy (HEA) constitute a novel class of promising high-temperature structural material, because of its excellent specific strength. Nevertheless, the inferior oxidation properties restrict the application of equimolar AlCoCrFeNi HEA. Herein, we report a novel Y/Sc co-doped AlCoCrFeNi HEA with superior mechanical and oxidation properties. The Y/Sc co-doped AlCoCrFeNi HEA comprises ordered B2 and disordered A2 BCC-structured phases. Y/Sc co-doping increases peak stress from ~ 79.2 ± 0.4 to ~ 81.8 ± 0.3 MPa because of solid-solution hardening and fine-grain hardening. The superior oxidation properties of the Y/Sc co-doped AlCoCrFeNi HEA are ascribed to the rapid establishment of a unique α-Al2O3 scale in the early oxidation period and the inhibition of Y/Sc ions on the outward diffused Al at scale grain boundaries in the long-term oxidation period. Moreover, Y/Sc co-doping has a synergistic effect on decreasing the oxidation rate. The influence of single- and co-doping on the oxide grain morphology and oxide growth mechanism is explored in depth. These findings provide a sustainable solution and a new approach to overcoming the looming issue of material deterioration at elevated temperatures.