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<p>High-entropy alloys (HEAs) have been extensively studied due to their exceptional high-temperature mechanical properties and wear resistance. Among them, AlCoCrFeNiMo₀.₈-TiC composite coatings exhibit outstanding wear resistance at room temperature, yet their high-temperature behavior remains insufficiently explored. In this study, high-temperature wear and cyclic oxidation tests were conducted at 500&#xa0;°C, 700&#xa0;°C, and 900&#xa0;°C to evaluate the oxidation behavior and tribological performance of these coatings. The oxidation products were primarily TiO₂, Al₂O₃, Cr₂O₃, and Fe₃O₄, with the weight gain following a parabolic trend. The mass increases per unit area were 0.0586, 0.2842, and 1.8112 mg·cm⁻<sup>2</sup> at 500&#xa0;°C, 700&#xa0;°C, and 900&#xa0;°C, respectively. As temperature increased, the formation of a dense glaze layer from the oxidation products resulted in a continuous reduction in the coefficient of friction (COF). The lowest wear rate was observed at 700&#xa0;°C (1.5586 × 10⁻⁷ mm<sup>3</sup>·N⁻<sup>1</sup>·m⁻<sup>1</sup>), followed by 500&#xa0;°C (6.2059 × 10⁻⁷ mm<sup>3</sup>·N⁻<sup>1</sup>·m⁻<sup>1</sup>). At 900&#xa0;°C, the glaze layer softened, leading to an increase in wear. Additionally, the dominant wear mechanism transitioned from abrasive wear at lower temperatures to oxidative wear at higher temperatures.</p>

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High-temperature wear and oxidation resistance of laser clad AlCoCrFeNiMo0.8-TiC composite coatings

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Han Yantao,
  • Li Guodong,
  • Li Yutao,
  • Ji Xiaoliang,
  • Wang Kaiming,
  • Yang Xiaojun,
  • Lin Jian,
  • Fu Hanguang

摘要

High-entropy alloys (HEAs) have been extensively studied due to their exceptional high-temperature mechanical properties and wear resistance. Among them, AlCoCrFeNiMo₀.₈-TiC composite coatings exhibit outstanding wear resistance at room temperature, yet their high-temperature behavior remains insufficiently explored. In this study, high-temperature wear and cyclic oxidation tests were conducted at 500 °C, 700 °C, and 900 °C to evaluate the oxidation behavior and tribological performance of these coatings. The oxidation products were primarily TiO₂, Al₂O₃, Cr₂O₃, and Fe₃O₄, with the weight gain following a parabolic trend. The mass increases per unit area were 0.0586, 0.2842, and 1.8112 mg·cm⁻2 at 500 °C, 700 °C, and 900 °C, respectively. As temperature increased, the formation of a dense glaze layer from the oxidation products resulted in a continuous reduction in the coefficient of friction (COF). The lowest wear rate was observed at 700 °C (1.5586 × 10⁻⁷ mm3·N⁻1·m⁻1), followed by 500 °C (6.2059 × 10⁻⁷ mm3·N⁻1·m⁻1). At 900 °C, the glaze layer softened, leading to an increase in wear. Additionally, the dominant wear mechanism transitioned from abrasive wear at lower temperatures to oxidative wear at higher temperatures.