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- W2026003145 abstract "Usually, ‘as-received’ thin foils and/or sheets of FeCrAl+RE (RE: mostly Y and Hf) alloys are subjected to oxidation exposures directed towards testing their high-temperature oxidation behaviour at 900 and 1000°C. However, their mechanical treatment during manufacturing has been carried out at elevated temperatures which might affect further oxidation processes by virtue of influencing the initial conditions of oxidation exposures that follow. To verify this possibility, Fe20Cr5Al+(Y+Hf) foils and sheets were prepared in two ways: either left without any further treatment after manufacturing (‘as-received’) or mechanically polished down with 1 μm diamond paste. The samples were subjected to two-stage-oxidation exposures using 18O2-tracer containing atmospheres, at 900°C and 1000°C, and examined subsequently with high-spatial-resolution secondary ion mass spectrometry analyses and secondary electron microscopy/electron diffraction X-ray. The starting materials were characterized with the aid of XPS and SIMS in order to determine their surface composition. A thin layer of Fe- and Al-rich oxides was found on the ‘as-received’ foils and sheets. The oxidation results showed at surface finishing and, to lesser extent, the thickness of the sample, affected both the scale growth mechanism, as well as its morphology and microstructure. An inward growth mechanism was observed on polished samples independent of alloy thickness, while the ‘asreceived’ samples exhibited a complex growth mechanism related to the stage of phase transformation of transient aluminas into α-Al2O3. Hence, polishing was found to accelerate this transformation. Surface roughness was found to be the major factor affecting the oxidation mechanism at relatively early oxidation stages and the influence of surface chemistry was much more significant for thin foils than for thicker materials." @default.
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- W2026003145 date "2009-09-01" @default.
- W2026003145 modified "2023-10-16" @default.
- W2026003145 title "The effect of surface finishing and sample thickness on the early oxidation mechanism of Fe20Cr5Al+RE alloys" @default.
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- W2026003145 doi "https://doi.org/10.3184/096034009x463925" @default.
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