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63 Ni grain boundary (GB) diffusion in polycrystalline γ-Fe – Ni alloy was measured by the conventional radiotracer method. The double product  P  =  δ  x  D  gb  ( δ  is the GB width and  D  gb  is the GB diffusivity) was found to follow the Arrhenius relationship  P  =1.31×10 −13 × exp(−157 kJ mol −1 / RT ) m 3 /s, where  R  is the gas constant and  T  is the temperature. The results in the coarse-grained material (grain size  d  ≈ 0.5 mm) were discussed in comparison with our previous investigation of Ni diffusion in a nanocrystalline alloy ( d  ≈ 100 nm) of the same composition.

Ni grain boundary diffusion in coarse-grained Fe-40 wt.% Ni alloy and comparison with Ni diffusion in the nanocrystalline alloy