Abstract
A study was conducted to examine the isothermal oxidation behavior of a wrought Ni-Cr-Al-Fe-Y alloy in air at temperatures in the range of 950–1150°C. Oxidation kinetics were determined from weight-change measurements. Analytical electron microscopy, scanning electron microscopy, and x-ray diffraction were used to characterize the morphology, structure, and composition of the oxide scale. Overall oxidation of the alloy was found to follow parabolic kinetics. Under steady-state conditions, the oxidation reaction appeared to be controlled by diffusional transport in an adherent Y-modified α-Al2O3 scale with an activation energy of about 400 KJ/mol. Yttrium was found to preferentially segregate to grain boundaries of α-Al2O3 which maintained a fine columnar grain structure about 0.05–0.2 μm in size. Based upon the results obtained, it was suggested that the role of Y was to promote the formation of a thin layer of α-Al2O3 with improved mechanical strength.
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Tawancy, H.M., Sridhar, N. High-temperature oxidation behavior of a Ni-Cr-Al-Fe-Y alloy. Oxid Met 37, 143–166 (1992). https://doi.org/10.1007/BF00665187
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DOI: https://doi.org/10.1007/BF00665187