GRAIN-BOUNDARY DISTRIBUTION IN HOT-STRAINED 80-WT-PERCENT-NI-20-WT-PERCENT-CR ALLOY

The distributions of grain boundaries in hot-strained 80 wt% Ni-20 wt% Cr alloy have been determined with respect to their misorientation an gles and the crystallographic axes, as well as to the reciprocal densi ty SIGMA of coincidence sites. It is established that the grain-bounda ry distribution in the alloy formed under high-temperature deformation differs from the stable grain-boundary spectrum typical of statically recrystallized materials that are prone to annealing twinning. There are also differences in the deformation behaviour of the samples with different spectra of grain boundaries. It is demonstrated that, in pri nciple, it is possible to control the material properties through the grain-boundary distribution.