The internal oxidation of alloys which contained between 0.069 and 0.274wt%Al was investigated at 1223 to 1373K in order to determine the diffusivity in the γ-phase and in the internal oxidation layer. The diffusion coefficient of O in the γ phase was determined by extrapolating to zero oxide volume fraction. The diffusivity could be described by:

D (cm2/s) = 1.30 x 100 exp[-39.5(kcal/mol)/RT]

J.Takada, S.Yamamoto, S.Kikuchi, M.Adachi: Metallurgical Transactions A, 1986, 17[2], 221-9