The Effect of Yttrium on the Growth Process and Microstructure of α-Al2O3 on FeCrAl
作者： C. Mennicke , E. Schumann , M. Ruhle , R. J. Hussey , G. I. Sproule
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摘要: The oxidation behavior of undoped and Y-dopedhigh-purity FeCrAl at 1200°C was investigated. Thescale-growth processes were studied using two-stage16O/18O experiments andhigh-resolution imaging SIMS. SEM, TEM, scanning transmission electronmicroscopy-electron-dispersive X-ray spectrometry(STEM-EDS) studies performed in order to determinethe microstructure the oxide chemistry metal-oxide interface. An equiaxedα-Al2O3 scale found togrow by simultaneous outward Al inward oxygendiffusion on FeCrAl. In contrast, a columnarα-Al2O3 grain structure Y-doped produced inwardoxygen diffusion; diffusion suppressed.Y shown segregate toα-Al2O3 boundaries andto
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