Within the sensitivity of the Super-X EDS mapping, no concentration gradient was detected near dislocations that would indicate enrichment at dislocation cores of any of the elemental constituents of the alloy after the pre-deformation and annealing. The cores of the 1/2 dislocations pushed up against the investigated grain boundaries were found to be close to the compact configuration. Interactions of this planar slip with special Σ3 grain boundaries formed a large number of dislocation segments with a -type crystallographic orientation suitable for a credible end-on analysis of dislocation cores in HR-STEM. The pre-strains activated planar slip of 1/2-type dislocations on -type glide planes. To that end, CrMnFeCoNi samples were first deformed in tension at room temperature to plastic strains of 0.2 and 2.3%, and subsequently annealed at 973 K for 800 hours. Particular attention is given to whether any of the alloy elements segregate to individual dislocations. The influence of small plastic pre-strains on the elevated-temperature stability and microstructure of the equiatomic CrMnFeCoNi FCC solid solution is investigated.
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