The effect of systematic variation of Ni:Co ratio on the oxidation behaviour of γ-γ' Ni-Co-Al-Ti-Cr alloys
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Llewelyn, S., Chater, R., Jones, N., Hardy, M., & Stone, H. (2021). The effect of systematic variation of Ni:Co ratio on the oxidation behaviour of γ-γ' Ni-Co-Al-Ti-Cr alloys. Corrosion Science, 178 https://doi.org/10.1016/j.corsci.2020.109087
The effect of Co:Ni ratio on the oxidation performance of γ-γ' alloys based on the (Ni,Co)75Al5Ti5Cr15 system (at.%) was investigated. Seven model superalloys of Co concentration 0, 9, 19, 28, 38, 47 and 56 at.% underwent isothermal oxidation in air at 800°C using both box-furnace exposure (1000 hours) and thermogravimetric analysis (100 hours). Following 1000 hours oxidation at 800°C, alloys containing 28, 38 and 47 at.% Co exhibited a flatter, more compact external scale and Cr2O3 layer as well as reduced oxygen ingress compared with alloys of lower Co content. The alloy containing 47 at.% Co exhibited two distinct morphologies.
This work was supported by Rolls-Royce plc and the EPSRC under EP/H022309/1 and EP/M005607/1.
UNIVERSITY OF BIRMINGHAM (FB EPSRC) (EP/H022309/1)
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External DOI: https://doi.org/10.1016/j.corsci.2020.109087
This record's URL: https://www.repository.cam.ac.uk/handle/1810/312251
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Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/