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<p>A comparative analysis on the effect of niobium, hafnium, or platinum additives on the microstructure, phase composition, and high-temperature oxidation resistance (1050&#xa0;°C) of Al<sub>0.5</sub>CoCrNiM<sub>0.1</sub> (M = Nb, Hf, Pt) high-entropy alloys (HEAs) was investigated. The results indicate that niobium and hafnium were separated as intermetallic phases (Laves phases for Al<sub>0.5</sub>CoCrNiNb<sub>0.1</sub> HEA; Ni<sub>7</sub>Hf<sub>2</sub> for Al<sub>0.5</sub>CoCrNiHf<sub>0.1</sub> HEA), while platinum remains within the solid solutions without any phase segregation. The niobium-containing alloy exhibits the highest oxidation rate at 1050&#xa0;°C, while the hafnium-containing HEA has the lowest oxidation rate. Oxidation mechanisms for each composition were assessed individually. It has been identified that the main role in resistance toward high-temperature dry air corrosion is played by the continuity of the formed film in HEAs. Loose and cracked areas are present in the surface oxide film on the Al<sub>0.5</sub>CoCrNiNb<sub>0.1</sub> HEA. At the same time, Al<sub>0.5</sub>CoCrNiHf<sub>0.1</sub> and Al<sub>0.5</sub>CoCrNiPt<sub>0.1</sub> alloys contain a dense, continuous, defect-free oxide scale.</p>

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Experimental Investigation of Oxidation Resistance of Al0.5CoCrNiM0.1 (M = Nb, Hf, Pt) High-Entropy Alloys at 1050 °C in Air

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Olga Samoilova,
  • Svetlana Pratskova,
  • Polina Plotnikova,
  • Nataliya Shaburova,
  • Mariappan Anandkumar,
  • Evgeny Trofimov

摘要

A comparative analysis on the effect of niobium, hafnium, or platinum additives on the microstructure, phase composition, and high-temperature oxidation resistance (1050 °C) of Al0.5CoCrNiM0.1 (M = Nb, Hf, Pt) high-entropy alloys (HEAs) was investigated. The results indicate that niobium and hafnium were separated as intermetallic phases (Laves phases for Al0.5CoCrNiNb0.1 HEA; Ni7Hf2 for Al0.5CoCrNiHf0.1 HEA), while platinum remains within the solid solutions without any phase segregation. The niobium-containing alloy exhibits the highest oxidation rate at 1050 °C, while the hafnium-containing HEA has the lowest oxidation rate. Oxidation mechanisms for each composition were assessed individually. It has been identified that the main role in resistance toward high-temperature dry air corrosion is played by the continuity of the formed film in HEAs. Loose and cracked areas are present in the surface oxide film on the Al0.5CoCrNiNb0.1 HEA. At the same time, Al0.5CoCrNiHf0.1 and Al0.5CoCrNiPt0.1 alloys contain a dense, continuous, defect-free oxide scale.