The calculation model of the diffusion coefficient under an external magnetic field was presented. The self-diffusion coefficient in the body-centered cubic α-Fe phase and the diffusion coefficients of Ni and Co in the α-Fe phase were calculated. The calculated results indicate that the diffusion coefficient decreased with the decreasing of temperature and increasing of external magnetic field intensity. The kinetics of the γ-Fe(fcc) to α-Fe(bcc) phase transformation under an external magnetic field in pure Fe and Fe-1at%C alloy were also studied. It was found that grain refinement under an external magnetic field was caused by the increase in nucleation rate and growth rate as well as the short transformation time.

Effects of External Magnetic Field on the Diffusion Coefficient and Kinetics of Phase Transformation in Pure Fe and Fe–C Alloys. X.J.Liu, Y.Lu, Y.M.Fang, C.P.Wang: Calphad, 2011, 35[1], 66-71