Kala, V.Santhy, K.Govindarajan, G.Rajasekaran, B.2026-02-042022Corrosion Science, 2022, 207, , pp. -0010938Xhttps://doi.org/10.1016/j.corsci.2022.110521https://idr.nitk.ac.in/handle/123456789/22388This study focuses on in-situ high-temperature X-ray diffraction (HT-XRD) investigation to understand the oxidation, microstructural evolution, and recrystallization of the NiCoCrAlY bond coat. HT-XRD analysis was carried out at a constant temperature of 1423 K for 3 h in a 10−4 Pa vacuum. The formation of α-Al<inf>2</inf>O<inf>3</inf>, Cr<inf>2</inf>O<inf>3</inf>, Co<inf>3</inf>O<inf>4</inf>, and NiCr<inf>2</inf>O<inf>4</inf> oxides and microstructural evolution, such as homogenization of phases (γ and β) during in-situ HT-XRD, has been analyzed with FE-SEM (EDS), Density Functional Theory calculations and Rietveld refinement's support. β-(Ni,Co)Al phase depletion (by 77%) was found at 1423 K during the HT-XRD; however, no TGO formation was noticed. © 2022 Elsevier LtdAluminaAluminum alloysAluminum oxideChromium alloysCobalt alloysDensity functional theoryMicrostructural evolutionOxidationRietveld refinementSuperalloysTernary alloysAnd selective oxidation (C)High-temperature X-ray diffractionNickel (A)Rietveld refinement (B)Selective oxidationSEM (B)Superalloy (A)XRDXRD (B)Nickel