Abstract
Bi-crystals of the nickel-base superalloy NIMONIC PE16 have been used as model systems to study the influence of precipitation free zones (PFZ) at grain boundaries on the critical resolved shear stress. Analyses of the slip lines and dislocation configurations have been performed. After ageing for different times, the samples have been compression tested. In addition to the primary slip systems in the interior of the grains, secondary ones were activated in a grain boundary affected zone. They allowed the compatible deformation. Influences of the PFZs were attributed to an easier penetration of slip bands into the neighbouring grains.
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