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<p>In this study, the oxidation behavior of IC10 nickel-based superalloy at different temperatures (850°C–1050&#xa0;°C) and its association with the evolution of the precipitated phase were discussed. The influence mechanism of temperature on oxidation rate, oxide layer structure, and mechanical properties of the alloy was revealed through high-temperature oxidation experiments combined with oxidation kinetic analysis, microhardness testing, and characterizations. The results showed that the oxidation process was divided into the rapid oxidation stage (0-30 hours) and diffusion control stage (30-60 hours), and the oxidation rate increased significantly with the increase of temperature (<i>e.g.,</i> the rate constant was 0.194 mg·cm<sup>−2</sup>/h at 1050&#xa0;°C). At high temperatures, Cr<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> synergize to form a protective oxide layer, but the formation of NiCr<sub>2</sub>O<sub>4</sub> spinel phase at 1050&#xa0;°C causes thermal expansion mismatch, resulting in oxide cracking and spalling. In addition, the γ'(Ni<sub>3</sub>Al) precipitates gradually dissolve with the increase of temperature, which weakens the matrix strengthening effect and causes the microhardness to decrease in the late stage of high temperature. This study reveals the complex interaction between oxide layer stability and precipitated phase evolution, which provides a theoretical basis for the design of nickel-based alloys with both high-temperature oxidation resistance and mechanical stability.</p>

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Co-evolution Mechanism of Oxidation Kinetics and Precipitates of IC10 Nickel-Based Superalloy Under Temperature Gradient and Its Effect on Mechanical Properties

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Hanyu Tian,
  • Jiayi Zhang,
  • Yeqing Wu,
  • Jia Chen

摘要

In this study, the oxidation behavior of IC10 nickel-based superalloy at different temperatures (850°C–1050 °C) and its association with the evolution of the precipitated phase were discussed. The influence mechanism of temperature on oxidation rate, oxide layer structure, and mechanical properties of the alloy was revealed through high-temperature oxidation experiments combined with oxidation kinetic analysis, microhardness testing, and characterizations. The results showed that the oxidation process was divided into the rapid oxidation stage (0-30 hours) and diffusion control stage (30-60 hours), and the oxidation rate increased significantly with the increase of temperature (e.g., the rate constant was 0.194 mg·cm−2/h at 1050 °C). At high temperatures, Cr2O3 and Al2O3 synergize to form a protective oxide layer, but the formation of NiCr2O4 spinel phase at 1050 °C causes thermal expansion mismatch, resulting in oxide cracking and spalling. In addition, the γ'(Ni3Al) precipitates gradually dissolve with the increase of temperature, which weakens the matrix strengthening effect and causes the microhardness to decrease in the late stage of high temperature. This study reveals the complex interaction between oxide layer stability and precipitated phase evolution, which provides a theoretical basis for the design of nickel-based alloys with both high-temperature oxidation resistance and mechanical stability.