Effect of Hf on high-temperature oxidation behavior of chromia-forming AlxCoCrFeNi alloys

M. Jawańska, J. Dąbrowa, M. Bik, Ł. Rogal, G. Cieślak, A. Gil, M.C. Galetz, J. Jedliński

Corrosion Science 240 (2024), 112455, DOI: 10.1016/j.corsci.2024.112455

jawanska2024

Results of weight change measurements during thermal-cyclic oxidation of the Hf-modified materials compared to the reference materials published in [14]. (a) net mass gain, (b) spall mass gain, (c) gross mass gain.
Reprinted from Corrosion Science with permission from Elsevier according to the Creative Commons license.

Nanodispersion of HfO2 is deposited on the surfaces of chromia-forming Alx(CoCrFeNi)100−x high entropy alloys (x = 3; 6; 9) to improve their resistance to high-temperature oxidation in air at 900 °C. A strong effect of Hf as a reactive element is well-confirmed through several-fold reduction in mass gains, suppressed scale spallation, simplified oxide scale composition (mainly Cr2O3), and inhibited internal oxidation and nitridation, compared to the unmodified reference materials. Its beneficial influence is visible particularly during the especially challenging long-term thermal cycling. The study proves the wide possibilities for obtaining highly efficient HEA-based materials for high-temperature industrial applications.

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