Abstract
Tensile experiments have established that polycrystals of stoichiometric Ni 3Al are brittle in air over the range of strain rate from 10 −4 to 7 s −1. Ni-rich polycrystals and boron-doped stoichiometric alloys undergo a brittle-to-ductile transition upon increasing strain rate. The transition correlates with the enrichment of nickel on the grain boundaries. The strain rate and (presumably) environmental effect appear to be caused by the embrittlement not of the Ni 3Al per se, but of the intergranulular Ni-enriched region.
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