Oxidation tests were performed isothermally at 1000°C on chill block melt spun metallic ribbons with alloy compositions consisting of Ni(46–50 at%), Al(31–33 at%), Co(17–20 at%) and Hf(0–1 at%). The oxidation rates were calculated and the microstructure was examined. Results indicated the difference in microstmctural and oxidation characteristics could largely be attributed to the differences in the superheat of the melt. There was no indication that hafnium retarded grain growth. The oxidation behavior of two of the ribbons exhibited a logarithmic rate law.
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Stewart, M.L., Aswath, P.B. A Study of the Processing and Compositional Variables on the Microstructural Development and Oxidation Characteristics of Rapidly Solidified NiAlCo Alloys. MRS Online Proceedings Library 288, 1007–1012 (1992). https://doi.org/10.1557/PROC-288-1007