Abstract
The internal oxidation behavior of Fe-0.069, 0.158, and 0.274 wt% Al alloys was investigated in the α-phase region. The internal oxidation experiments have been made over the temperature range from 1023 to 1123 K using a mixture of iron and its oxide powders. A parabolic rate law holds in the present alloys, where the rate constant, Kp, depends upon the oxidation temperature as well as the aluminum content. The internal oxidation of Fe-Al alloys is, therefore, controlled by a diffusion process of oxygen in the alloy. The oxide formed in the oxidation layer is the stoichiometric FeAl2O4 (hercynite). The aluminum concentration, N IoAl , in the oxidation layer was calculated by taking account of counterdiffusion of aluminum. Furthermore, the oxygen concentration, N SO , at the specimen surface was evaluated on the basis of thermodynamics. Using these estimated values of Kp, N IOAl , and N SO , the diffusion coefficient of oxygen, D IOO , in the oxidation layer, where the oxide particles were dispersed, was also calculated. D IOO increases as the volume fraction of the oxide, fIO, increases. The diffusion coefficient of oxygen, DO, in α-iron was determined by extrapolating D IOO to fIO=0.
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Takada, J., Yamamoto, S., Kikuchi, S. et al. Internal oxidation of Fe-Al alloys in the α-phase region. Oxid Met 25, 93–105 (1986). https://doi.org/10.1007/BF00807998
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DOI: https://doi.org/10.1007/BF00807998