Abstract
A model is developed to explain the experimental observation that small additions of boron to Ni3Al reduce the effectiveness with which grain boundaries strenghthen the alloy, following the proposal of Schulson et al. [Acta metall.34, 1395 (1986); Scripta metall.19, 1497 (1985)]. This model is based on the effect of ordering on the mobility of grain boundary dislocations. If the addition of boron lowers the difference in energy between different ordering configurations at the boundary, then it should promote accommodation of stress concentrations by the motion of grain boundary dislocations.
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