Delayed parabolic oxidation via transient thermal exposures on a polycrystalline nickel-based superalloy
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Multiple oxides were observed during the transient oxidation stage of the polycrystalline Ni-based superalloy, RR1000, before a protective Cr2O3 scale formed. Thermogravimetric analysis, synchrotron grazing incidence X-ray diffraction, and electron microscopy were performed on samples subjected to isothermal exposures at 800 °C for up to 100 h. Transient effects governed the early stages up to 40 h. NiO, spinels (NiCr2O4, (Ni,Co)(Cr,Co)2O4), Cr2O3/(Cr0.88Ti0.12)2O3, NiTiO3, and CrTaO4 formed during the initial stage with pseudo-linear kinetics. At the onset of parabolic kinetics, extensive Cr2O3 and TiO2 growth dominated scale formation with the former emerging as the major passivating oxide.
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Corrosion Science
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0010-938X
1879-0496
1879-0496
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Elsevier
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Except where otherwised noted, this item's license is described as Attribution 4.0 International
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The authors are grateful to the Cambridge Trusts and Rolls-Royce plc for financial support. The provision of beamtime at the I11 instrument, Diamond Light Source is acknowledged under Proposal EE18972. JWXW acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), [funding reference number PGSD3-532682-2019]. Cette recherche a été financée par le Conseil de recherches en sciences naturelles et en génie du Canada (CRSNG), [numéro de référence PGSD3-532682-2019].