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- W3119468450 abstract "The oxidation properties of a family of novel polycrystalline Ni-based superalloys with varying Ti:Nb ratio have been studied, which has shown a correlation between increasing titanium content and accelerated oxidation kinetics. High-resolution characterization of microstructure and chemistry was carried out on the resultant oxide layers using SEM/EDX and Atom Probe Tomography to precisely locate Ti segregation within chromia scales, in order to identify a potential mechanism to explain this correlation. Despite some spread in the data, levels of Ti dissolved in the chromia oxide scales showed little correlation with the nominal Ti concentration or the oxidation properties of each alloy, indicating that oxidation rates are not reliant on dopant levels within bulk chromia. A number of grain boundaries within the oxide scale were targeted for APT analysis, as these are known to act as short-circuit diffusion paths. Segregation of Ti, Nb and Ta to oxide grain boundaries was observed, suggesting that ion transport rates may instead be mediated by dopants present at grain boundaries rather than dissolved within the bulk." @default.
- W3119468450 created "2021-01-18" @default.
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- W3119468450 date "2021-03-01" @default.
- W3119468450 modified "2023-10-16" @default.
- W3119468450 title "Characterization of oxidation mechanisms in a family of polycrystalline chromia-forming nickel-base superalloys" @default.
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- W3119468450 doi "https://doi.org/10.1016/j.actamat.2021.116626" @default.
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