The coefficient of 65Zn heterodiffusion in Mg-33.4wt%Al eutectic was measured at 598 to 698K using serial sectioning and residual activity methods. Above 648K, where the mean diffusion path was greater than the mean interlamellar distance in the eutectic, the effective diffusion coefficient was given by,

D(m2/s) = 2.7 x 10-2exp[-155.1(kJ/mol)/RT]

At two lower temperatures, the diffusion coefficients of 65Zn in the interphase boundaries were estimated to be 1.6 x 10-12m2/s at 623K and 4.4 x 10-13m2/s at

598K.

I.Stloukal, J.Čermák: Defect and Diffusion Forum, 2007, 263, 189-94. See also: International Journal of Materials Research, 2006, 97[11], 1476-83