Abstract
To develop a nondestructive analytical method for identifying internal α-Al2O3 scales formed in heat-resistant alloys, the maximum thickness of surface Cr2O3 scales for identifying internal α-Al2O3 scales via cathodoluminescence (CL) spectroscopy was estimated using integral intensity of CL peak at 695 nm (R1-R2 doublet) for Cr2O3 film-deposited sapphires and α-Al2O3 scales formed on the surface of Fe-Cr-Al alloys. The estimated maximum Cr2O3 thickness was validated by measuring the intensities of the R1-R2 doublet for Ni-25Cr-5Al alloys heated at 1000 °C under oxygen. Therefore, internal α-Al2O3 scales can be identified nondestructively by acquiring the surface CL spectra up to ~ 3-µm surface Cr2O3 thickness.
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Financial support for the present study was provided by JSPS KAKENHI Grant Number 22H01837.
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Imashuku, S. Determination of the Maximum Surface Chromia Thickness for the Nondestructive Identification of Internal Alumina Scales on a Heat-resistant Alloy Using Cathodoluminescence. High Temperature Corrosion of mater. 101, 79–90 (2024). https://doi.org/10.1007/s11085-023-10217-8
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DOI: https://doi.org/10.1007/s11085-023-10217-8