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<p>We report a type of superior oxidation and spallation-resistant Y<sub>2</sub>O<sub>3</sub>-doped Fe-Mn-Cr-Ni medium-entropy alloy (MEA) fabricated by spark plasma sintering. A continuous weight-gain oxidation experiment was designed to study the oxidation kinetics of undoped Fe-Mn-Cr-Ni MEA and Y<sub>2</sub>O<sub>3</sub>-doped Fe-Mn-Cr-Ni MEA. The microstructures of oxide scale and the potential oxidation mechanisms are discussed. The results indicate that the oxidation and spallation resistance of Fe-Mn-Cr-Ni MEA can be enhanced through Y<sub>2</sub>O<sub>3</sub> doping. The two MEAs follow the single-stage parabolic law at temperatures ranging from 700°C to 900°C. Y<sub>2</sub>O<sub>3</sub>-doped MEA exhibits a lower oxidation rate, characterized by oxidation rate constant of 0.025&#xa0;mg<sup>2</sup>&#xa0;cm<sup>-4</sup>&#xa0;min<sup>-1</sup>, which is 86.8% lower than that of Y<sub>2</sub>O<sub>3</sub>-free MEA at 900°C. The oxidation activation energy of Y<sub>2</sub>O<sub>3</sub>-doped MEA is 135.3&#xa0;kJ/mol, which is 30.5% higher than that of Y<sub>2</sub>O<sub>3</sub>-free MEA. The Y<sub>2</sub>O<sub>3</sub>-doped MEA demonstrates much better resistance to the oxide scale spallation compared with the Y<sub>2</sub>O<sub>3</sub>-free MEA, resulting from the good suppression of interface rumpling.</p>

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Y2O3-Doped Fe-Mn-Ni-Cr Medium Entropy Alloy with Superior Oxidation and Spallation Resistance Fabricated by Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Ya-Yun Wu,
  • Xiao-Jie Du,
  • Xi-Quan Jia,
  • Zhen-Lin Xu,
  • Xue-Ting Wu,
  • Yi-Zhu He

摘要

We report a type of superior oxidation and spallation-resistant Y2O3-doped Fe-Mn-Cr-Ni medium-entropy alloy (MEA) fabricated by spark plasma sintering. A continuous weight-gain oxidation experiment was designed to study the oxidation kinetics of undoped Fe-Mn-Cr-Ni MEA and Y2O3-doped Fe-Mn-Cr-Ni MEA. The microstructures of oxide scale and the potential oxidation mechanisms are discussed. The results indicate that the oxidation and spallation resistance of Fe-Mn-Cr-Ni MEA can be enhanced through Y2O3 doping. The two MEAs follow the single-stage parabolic law at temperatures ranging from 700°C to 900°C. Y2O3-doped MEA exhibits a lower oxidation rate, characterized by oxidation rate constant of 0.025 mg2 cm-4 min-1, which is 86.8% lower than that of Y2O3-free MEA at 900°C. The oxidation activation energy of Y2O3-doped MEA is 135.3 kJ/mol, which is 30.5% higher than that of Y2O3-free MEA. The Y2O3-doped MEA demonstrates much better resistance to the oxide scale spallation compared with the Y2O3-free MEA, resulting from the good suppression of interface rumpling.