Abstract
Using Ni-coated Fe powder and Fe-Ni alloy powder, the mechanism of activated sintering with Ni addition was investigated by a dilatometer and autoradiography.The shrinkage of Ni-coated Fe powder increased with increasing Ni content up to 0.08 wt%. Over 0.08 wt%Ni, the shrinkage became constant, where the slope (rate exponent) measured from the logΔL⁄L0−logt relation was about 0.32.The activation energy of sintering of the 1.0 wt%Ni-coated Fe powder compacts was about 40000 cal/mol, which is similar to that obtained for the self grain boundary diffusion of Fe.The results of autoradiography of the radioactive Fe into pure Fe powder and 1.0 wt%Ni-coated Fe powder compacts, confirmed that the presence of Ni in the grain boundaries promoted the grain boundary diffusion of Fe.Consequently, it becomes clear that the grain boundary diffusion of Fe should play an important role in the activated sintering for the Fe-Ni system.
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