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<p>AlCoCrFeNi<sub>2.1</sub> eutectic high-entropy alloy exhibits excellent castability, high strength, hardness, corrosion resistance, and thermal stability, showing promise for cracking furnace tubes. However, its oxidation and carbon diffusion behavior under high carbon potential remains unclear. In this work, the Al<sub><i>x</i></sub>CoCr<sub>2−<i>x</i></sub>FeNi<sub>2.1</sub> alloys were synthesized by vacuum arc melting and oxidized at 950&#xa0;°C for 8&#xa0;h in a solid carburizing atmosphere. Alloys with <i>x</i> ≤ 0.4 showed a single FCC phase, while a B2 phase appeared and increased at <i>x</i> ≥ 0.6. No obvious carbon diffusion or carbide formation was detected based on the SEM/EDS analysis. Instead, <i>a</i> ~ 3&#xa0;μm oxide scale formed with a continuous Al-depleted FCC region beneath. Increasing Al content did not significantly change the oxide thickness but shifted its composition from mixed Al<sub>2</sub>O<sub>3</sub> + Cr<sub>2</sub>O<sub>3</sub> to single-phase Al<sub>2</sub>O<sub>3</sub>. The dense Al<sub>2</sub>O<sub>3</sub> layer effectively suppressed further oxidation and carburization at 950&#xa0;°C.</p>

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Oxidation Behavior of AlxCoCr2−xFeNi2.1 High-Entropy Alloys in Solid Carburizing Atmosphere

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Changjun Wu,
  • Chao Li,
  • Ya Liu,
  • Zhiyan Ding,
  • Haoping Peng,
  • Xiangying Zhu,
  • Xuping Su

摘要

AlCoCrFeNi2.1 eutectic high-entropy alloy exhibits excellent castability, high strength, hardness, corrosion resistance, and thermal stability, showing promise for cracking furnace tubes. However, its oxidation and carbon diffusion behavior under high carbon potential remains unclear. In this work, the AlxCoCr2−xFeNi2.1 alloys were synthesized by vacuum arc melting and oxidized at 950 °C for 8 h in a solid carburizing atmosphere. Alloys with x ≤ 0.4 showed a single FCC phase, while a B2 phase appeared and increased at x ≥ 0.6. No obvious carbon diffusion or carbide formation was detected based on the SEM/EDS analysis. Instead, a ~ 3 μm oxide scale formed with a continuous Al-depleted FCC region beneath. Increasing Al content did not significantly change the oxide thickness but shifted its composition from mixed Al2O3 + Cr2O3 to single-phase Al2O3. The dense Al2O3 layer effectively suppressed further oxidation and carburization at 950 °C.