Abstract
Abstract The grain-boundary diffusion (GBD) of 59 Fe in pure and in Cr-, Fe- and Zr-doped Ni 3 Al alloys was studied at temperatures between 873 and 1273 K using the serial sectioning method. The grain-boundary diffusivities P ( P is a product of grain-boundary width δ , and the diffusion coefficient in the grain-boundary D b ) were obtained from the penetration profiles using both the Le Claire’s analysis and direct fit of Suzuoka’s solution. The activation enthalpies of 59 Fe GBD were somewhat lower in comparison with analogous values for 51 Cr GBD, reported in our previous paper.
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