The diffusion coefficient of Ag was measured during Ag precipitation from dilute solid solutions by using 110Ag radiotracers at temperatures of between 327 and 363K (table 219). The activation energy (49.4kJ/mol) was smaller than the activation energy (60kJ/mol) for Ag diffusion in pure Pb but was in reasonable agreement with a published value (50kJ/mol) of the activation energy for the precipitation of Ag. The evidence for the suggestion that (Pb-Ag) pairs were the defects which were responsible for Ag migration during precipitation in these dilute alloys, and for Ag diffusion in pure Pb and Pb-Ag solid solutions, was considered.

A.Menaï, H.Amenzou, G.Moya, J.Bernardini: Acta Metallurgica et Materialia, 1994, 42[12], 4049-58