The interface diffusion of 210Pb tracer was measured in oriented 38wt%Pb eutectic specimens with a lamellar structure. The product of the interface diffusion coefficient and the width, δD, obeyed an Arrhenius relationship below 400K. The results could be described by:

D (m3/s) = 7 x 10-10 exp[-84.8(kJ/mol)/RT]

An interface energy of 150mJ/m2 was deduced from the diffusion measurements. At temperatures above 400K, the diffusivities deviated from an Arrhenius relationship and rose steeply. They finally merged with previously determined grain-boundary diffusion data for polycrystalline Pb and Pb-Sn alloys.

D.Gupta, K.Vieregge, W.Gust: Acta Materialia, 1999, 47[1], 5-12