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- W4283704834 abstract "Abstract Ni-based superalloys offer a unique combination of mechanical properties, corrosion resistance and high temperature performance. Near ambient pressure X-ray photoelectron spectroscopy was used to study in operando the initial steps of oxidation for Ni-5Cr, Ni-15Cr, Ni-30Cr and Ni-15Cr-6W at 500 °C, p(O 2 )=10 −6 mbar. The comparison of oxide evolution for these alloys quantifies the outsized impact of W in promoting chromia formation. For the binary alloys an increase in chromia due to Cr-surface enrichment is followed by NiO nucleation and growth thus seeding a dual-layer structure. The addition of W (Ni-15Cr-6W) shifts the reaction pathways towards chromia thus enhancing oxide quality. Density functional theory calculations confirm that W atoms adjacent to Cr create highly favorable oxygen adsorption sites. The addition of W supercharges the reactivity of Cr with oxygen essentially funneling oxygen atoms into Cr sites. The experimental results are discussed in the context of surface composition, chemistry, reactant fluxes, and microstructure." @default.
- W4283704834 created "2022-06-30" @default.
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- W4283704834 date "2022-06-29" @default.
- W4283704834 modified "2023-09-30" @default.
- W4283704834 title "Unraveling the role of tungsten as a minor alloying element in the oxidation NiCr alloys" @default.
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- W4283704834 doi "https://doi.org/10.1038/s41529-022-00265-x" @default.
- W4283704834 hasPublicationYear "2022" @default.
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