Abstract
The zinc concentrations of zinc-rich regions formed in a pure copper specimen by diffusion induced grain boundary migration (DIGM) and diffusion induced recrystallization (DIR) with a zincification technique are observed to be typically lower than that of the CuZn zinc source alloy. This phenomenon in the Cu(Zn) system has been analyzed on the basis of a new model to evaluate the chemical driving force of the reactions. The activity of zinc in the zincification atmosphere is assumed to be constant during the reaction. A contribution of the zinc atoms, which diffuse from the atmosphere into the specimen, to the Gibbs energy change of the reaction is considered in the model. The molar Gibbs energy of the copper-rich solid solution phase has been described using a subregular solution model. The experimental results have been accounted for rather well in DIR but not in DIGM. On the other hand, a rather satisfactory agreement between calculation and experiment for DIGM has been obtained through consideration of the effect of an elastic stress on the Gibbs energy of the alloyed phase.
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