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Research Article

Oxidation behavior of a high Hf nickel-based superalloy in air at 900, 1000 and 1100°C


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  • Received: 15 July 2020Revised: 28 September 2020Accepted: 30 September 2020Available online: 1 October 2020
  • In order to investigate the oxidation behavior of a nickel-based superalloy containing high hafnium content (1.34 wt%), isothermal oxidation tests were performed at 900, 1000 and 1100°C for up to 200 h. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS) were applied to study the oxidation behavior. Weight gain of the experimental superalloy exhibits a parabola-like curve and no spallation of the oxide scale was observed in the oxidation tests. The alloy presents excellent oxidation resistance and no HfO2 is observed in the oxide scale at 900°C. Elevating the oxidation temperature up to 1000°C, HfO2 particles form in the spinel phases of the scale, and “pegs” HfO2 is observed within and beneath the inner layer of Al2O3 after 200 hours. As the oxidation temperature elevated to 1100°C, “pegs” HfO2 is observed at the early stage of oxidation test (within 25 hours). Formation mechanism of HfO2 and the impact on oxidation resistance are investigated based on the analysis of oxidation tests results at different temperatures.
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Oxidation behavior of a high Hf nickel-based superalloy in air at 900, 1000 and 1100°C


  • Corresponding author:

    Dong Wang    E-mail: dwang@imr.ac.cn

  • 1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • 2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Abstract: In order to investigate the oxidation behavior of a nickel-based superalloy containing high hafnium content (1.34 wt%), isothermal oxidation tests were performed at 900, 1000 and 1100°C for up to 200 h. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS) were applied to study the oxidation behavior. Weight gain of the experimental superalloy exhibits a parabola-like curve and no spallation of the oxide scale was observed in the oxidation tests. The alloy presents excellent oxidation resistance and no HfO2 is observed in the oxide scale at 900°C. Elevating the oxidation temperature up to 1000°C, HfO2 particles form in the spinel phases of the scale, and “pegs” HfO2 is observed within and beneath the inner layer of Al2O3 after 200 hours. As the oxidation temperature elevated to 1100°C, “pegs” HfO2 is observed at the early stage of oxidation test (within 25 hours). Formation mechanism of HfO2 and the impact on oxidation resistance are investigated based on the analysis of oxidation tests results at different temperatures.

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