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- W2759624032 abstract "Fe – 1 at.%Al - x at.%Cr (x = 0, 2, 5) alloys were annealed at 1050 °C in Ar + 10 vol.% H2 gas mixture with dew point of -45 °C in order to study the behaviour of internal oxidation of Fe-Al and Fe-Al-Cr alloys under low oxygen partial pressure. During annealing an internal oxidation zone of Al2O3 is formed while Cr remains in solid solution in the iron matrix. The kinetics of internal oxidation of Fe – 1 at.%Al - x at.%Cr (x = 0, 2, 5, 10) alloys follow a parabolic rate law. However, the internal oxidation of Fe – 1 at.%Al binary alloy is much faster than predicted from the classical internal oxidation theories. The interfaces between alloy matrix and internal Al2O3 precipitates may enhance oxygen diffusion, thereby promoting internal oxidation of Al. Adding Cr does not change the internal oxidation kinetics of Al. Cr in Fe based alloys promotes oxygen dissolution but decreases the diffusivity of the dissolved oxygen. An internal oxidation zone of Al2O3 and external Cr2O3 scale are formed after annealing Fe - 1 at.%Al - 10 at.%Cr alloys at 1050 °C in Ar + 5 vol.% H2 gas mixture with a dew point of -30 °C. The kinetics of internal oxidation of Al beneath the Cr2O3 scale follow a parabolic rate law. Also, the kinetics of external oxidation of Cr obey a parabolic rate law. The internal oxidation kinetics of Fe-1at.%Al alloy increases with ambient oxygen partial pressure." @default.
- W2759624032 created "2017-10-06" @default.
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- W2759624032 date "2016-01-01" @default.
- W2759624032 modified "2023-09-27" @default.
- W2759624032 title "Kinetics of internal oxidation of FeAlCr alloys at low oxygen partial pressures" @default.
- W2759624032 hasPublicationYear "2016" @default.
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