The diffusion of 59Fe was studied by using serial sectioning and autoradiographic techniques at 1020 to 1500K (volume diffusion) and 750 to 1100K (grain boundary diffusion). The bulk diffusivity at 1020 to 1500K could be described by:

D (m2/s) = 3.26 x 10-5 exp[-259.6(kJ/mol)/RT]

The grain boundary diffusion coefficients were usually evaluated by using Whipple’s method. In a few cases, Suzuoka’s method was used. The grain boundary diffusivities at 750 to 1100K could be described by:

D (m2/s) = 1.88 x 10-5 exp[-160.7(kJ/mol)/RT]

A.R.Paul, M.C.Naik, K.N.G.Kaimal: Materials Science and Technology, 1991, 7[1], 8-11