Abstract
Using a heat flux differential calorimeter, silver precipitation in lead was studied over the temperature range 90–15°C. It was observed that the kinetics of precipitation depends on the silver concentration: present results only concern dilute alloys (96–290 · 10 −6 at/at). For these concentrations thermal effects lead to a precipitation enthalpy value in fair agreement with silver dissolution enthalpy in lead and to first order reactions. The precipitation occurs in a single stage with an activation enthalpy equal to (0.51 ± 0.03) eV. It is suggested that this activation enthalpy represents the migration enthalpy of the mixed dumbbell Ag-Pb, rather than that of either the Ag-vacancy pair or the dumb-bell Ag-Ag.
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