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

The best linear fits to the solute diffusion data ([783] to [785], [793] to [796], [822] to [825], [830] to [832], [835] to [844], [848] to [855]) yield:

C: Ln[Do] = 1.23E – 28.8 (R2 = 0.995); Cu: Ln[Do] = 0.36E – 15 (R2 = 0.64);

H(l): Ln[Do] = 0.45E – 7.5 (R2 = 0.97); N: Ln[Do] = 0.20E – 8.3 (R2 = 0.97);

Ni: Ln[Do] = 0.58E – 37.4 (R2 = 0.24); O: Ln[Do] = 0.29E – 12 (R2 = 0.96);

S: Ln[Do] = 0.40E – 19.6 (R2 = 0.76)