Bulk and grain boundary diffusion of Ag in γ-FeNi alloy

Abstract

Abstract Solute diffusion of Ag in polycrystalline γ-Fe-40 wt.% Ni alloy was studied by means of the radiotracer technique. For bulk and grain boundary diffusion, the following Arrhenius parameters were established: D v 0 = 1.2 × 10 − 3 m 2 / s $ D_v^0 = 1.2 \times {10^{ - 3}}{m^2}/s $ and Q v = 279 kJ/mol and P 0 = 8:1 ⨯ 10–14 m3/s and Q gb = 126 kJ/mol, respectively. The diffusion profiles reflect the very low Ag solid solubility which was estimated in the alloy via the specific activity of the applied 110mAg radiotracer.