Abstract
It is shown that the addition of Y to an alloy based upon the Ni–Cr–Al system slightly reduces the growth rate of Al2O3 scale during isothermal oxidation in air at temperatures in the range of 950–1150 °C. However, Y segregation at grain boundaries of the oxide is found to refine its grain structure down to the nanoscale with improved mechanical strength as compared to the Y-free alloy. It is concluded that Y can have the effect of decelerating the kinetics of diffusion processes leading to grain growth of the oxide.
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The author is grateful for the continued support provided by King Fahd University of Petroleum and Minerals.
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Tawancy, H.M. On the Role of Yttrium in Alumina Formers: Comparative Oxidation Behavior of (Ni–Cr–Al)- and (Ni–Cr–Al–Y)-Based Alloys. Oxid Met 86, 371–383 (2016). https://doi.org/10.1007/s11085-016-9642-z
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DOI: https://doi.org/10.1007/s11085-016-9642-z