Abstract
The formation and growth of disc-shaped aggregates consisting of rod-shaped Ag precipitates and Ag-depleted Cu matrix in the {100} planes in single crystals of a Cu–5.7 wt% Ag alloy have been investigated by transmission electron microscopy. The formation of the aggregates begins on dislocations and their growth progresses through a discontinuous process without existing dislocations. The aggregates grow at a constant velocity in an isothermal condition, maintaining a constant inter-rod spacing. A kinetic analysis of the aggregate growth using the model of Zener has yielded values of the diffusivity of Ag in Cu. The estimated activation energy for diffusion is 185 kJ mol−1.
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