Abstract
The effect of stoichiometry on grain boundary self-diffusion of Ni in Ni3AI was investigated for compositions between 73 and 78 at.% Ni in pure Ni 3 Al alloys in the temperature range from 968 to 1190 K. Diffusion penetration profiles were obtained by a serial sectioning technique using the radiotracer 63 Ni and sensitive liquid scintillation counting. A remarkable V-shaped concentration dependence of the grain boundary diffusion parameter P with a minimum near the stoichiometric composition was observed. The grain boundary diffusion activation enthalpy Q gb Ni decreases with increasing deviation of the Ni concentration from approximately stoichiometric Ni 3 Al. This behaviour can be understood and will be discussed with respect to computer simulation studies of the change in composition and state of order of grain boundaries in non-stoichiometric Ni 3 Al.
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