The lattice diffusion of Cu in γ-Fe was measured at 1105 to 1210C by using the residual activity method and the radiotracer, 64Cu. The results were described by:

D (cm2/s) = 4.16 x 108 exp[-72.6(kcal/mol)/RT]

K.Majima, H.Mitani: Transactions of the Japan Institute of Metals, 1978, 19[12], 663-8