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<p>The multi-element synergistic effect of high-entropy alloys results in excellent properties during electrolysis; however, they still face high-temperature oxidative corrosion. In this paper, the oxidation behavior of FeNiCuCoCr<sub><i>x</i></sub> (<i>x</i> = 0, 0.5, 1, 1.5, 2) alloys with varying Cr contents in air at 900°C was investigated, along with the microstructural characteristics of these alloys. The FeNiCuCoCr<sub>0-1.5</sub> alloy consists of the Cu-rich FCC<sub>1</sub> phase and the relatively uniform FCC<sub>2</sub> phase. Excessive Cr content can lead to the precipitation of BCC phases in FeNiCuCoCr<sub>2</sub> alloys. The oxidation kinetics of FeNiCuCoCr<sub><i>x</i></sub> at 900°C follow the parabolic rate law. As the Cr content in the alloy increases, the oxidation rate constant first decreases and then increases. In the early stage of oxidation, the addition of Cr element promoted the transformation of the outermost oxide film from a single CuO to CuCrO<sub>2</sub> and a small amount of CuCr<sub>2</sub>O<sub>4</sub>, which greatly improved the oxidation resistance of the alloy. A detailed discussion on the evolutionary mechanism of the alloy oxide film is presented.</p>

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Revealing the Mechanism of Oxidative Evolution of FeNiCuCoCrx High-Entropy Alloys at 900℃

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Guang-Xin Wu,
  • Hao Chen,
  • Peng-Cheng Qu,
  • Yun-Ze Qiao,
  • Yu Hua,
  • Yu-Jie Wang,
  • Ying-de Huang,
  • Wen-jie Yang

摘要

The multi-element synergistic effect of high-entropy alloys results in excellent properties during electrolysis; however, they still face high-temperature oxidative corrosion. In this paper, the oxidation behavior of FeNiCuCoCrx (x = 0, 0.5, 1, 1.5, 2) alloys with varying Cr contents in air at 900°C was investigated, along with the microstructural characteristics of these alloys. The FeNiCuCoCr0-1.5 alloy consists of the Cu-rich FCC1 phase and the relatively uniform FCC2 phase. Excessive Cr content can lead to the precipitation of BCC phases in FeNiCuCoCr2 alloys. The oxidation kinetics of FeNiCuCoCrx at 900°C follow the parabolic rate law. As the Cr content in the alloy increases, the oxidation rate constant first decreases and then increases. In the early stage of oxidation, the addition of Cr element promoted the transformation of the outermost oxide film from a single CuO to CuCrO2 and a small amount of CuCr2O4, which greatly improved the oxidation resistance of the alloy. A detailed discussion on the evolutionary mechanism of the alloy oxide film is presented.