In fine-grained polycrystalline solids both lattice and grain- boundary diffusion contribute to the effective volume diffusivity. In tracer diffusion experiments the concentration-penetration profiles can be suitably analyzed to distinguish between these two components. This paper presents new data on (super 59)Fe diffusion in fine-grained molybdenum stabilized stainless steel in the temperature range 1178-1483 K. While the near surface regions of the concentration-penetration curves were analyzed for lattice-diffusion, the grain-boundary diffusion ...
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