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<p>Nickel-based single-crystal superalloys (NBSX superalloys) are indispensable for aeroengine components, owing to their superior high-temperature performance. This study investigates the oxidation behavior of the DD6 NBSX superalloy across four temperatures (650, 800, 950, and 1100&#xa0;°C) over 150&#xa0;h. The oxidation morphology and elemental distribution—both on the surface and in cross-sections—were characterized using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Furthermore, the mechanical properties of the resulting oxide films were evaluated via nanoindentation. The results indicate that dendritic regions are more susceptible to oxidation than interdendritic regions. With rising oxidation temperatures, both hardness and elastic modulus exhibit a downward trend. Conversely, creep displacement, steady-state creep strain rate, and plastic indentation depth (including its ratio to maximum depth) increase significantly. At any given temperature, the interdendritic regions demonstrate higher creep sensitivity and plastic deformation capacity than the dendritic regions, as evidenced by their greater creep rates and indentation depths.</p>

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Study on the Oxidation Behavior and Mechanical Properties of Oxidation Products of DD6 Nickel-Based Single-Crystal Superalloy at the Temperature Range of 650-1100 °C

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Xinkuo Ji,
  • Huanhuan Lu,
  • Chenfei Song,
  • Chao Sun,
  • Gesheng Xiao

摘要

Nickel-based single-crystal superalloys (NBSX superalloys) are indispensable for aeroengine components, owing to their superior high-temperature performance. This study investigates the oxidation behavior of the DD6 NBSX superalloy across four temperatures (650, 800, 950, and 1100 °C) over 150 h. The oxidation morphology and elemental distribution—both on the surface and in cross-sections—were characterized using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Furthermore, the mechanical properties of the resulting oxide films were evaluated via nanoindentation. The results indicate that dendritic regions are more susceptible to oxidation than interdendritic regions. With rising oxidation temperatures, both hardness and elastic modulus exhibit a downward trend. Conversely, creep displacement, steady-state creep strain rate, and plastic indentation depth (including its ratio to maximum depth) increase significantly. At any given temperature, the interdendritic regions demonstrate higher creep sensitivity and plastic deformation capacity than the dendritic regions, as evidenced by their greater creep rates and indentation depths.