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Tracer grain-boundary diffusion of 63 Ni in slightly hypostoichiometric (x Al <25 at.%) Ni 3 Al alloys containing several percents of Cr, Fe and Zr was studied using both serial sectioning and residual activity methods. Measurements of grain-boundary diffusivity P were carried out in the temperature interval 873-1273 K. It was found that the additions of Cr, Fe...