Abstract
The isothermal oxidation behavior of a directionally solidified Ni-Al-Cr3C2 eutectic alloy in flowing air at 1100° C has been studied using various physical techniques. Initially, the alloy oxidizes relatively slowly as a protective α- Al2O3 layer develops on its surface. However, this layer breaks down mechanically at temperature, enabling a more rapidly growing Cr2O3 -rich scale to develop, the carbide fibers supplying chromium for the oxidation process. The extent of oxidation is further increased by the development of substantial amounts of internal oxide in the alloy beneath this scale, with some preferential oxidation down the alloy-carbide fiber interfaces. The influence of carbide fiber orientation on the oxidation behavior is considered and discussed in relation to proposed oxidation mechanisms.
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Stott, F.H., Wood, G.C. & Fountain, J.G. High-temperature oxidation of directionally solidified Ni-Al-Cr3C2 eutectic. Oxid Met 14, 31–45 (1980). https://doi.org/10.1007/BF00604102
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DOI: https://doi.org/10.1007/BF00604102