Diffusion annealing was carried out under Ar pressures of up to 0.8GPa. The activation volumes for diffusion were determined by isothermal annealing, giving:

D (cm2/s) = 7.7 x 103 exp[-52.6(kcal/mol)/RT]

G.Rummel, T.Zumkley, M.Eggersmann, K.Freitag, H.Mehrer: Zeitschrift für Metallkunde, 1995, 86[2], 131-40