Solute partitioning and site preference in γ/γ′ cobalt-base alloys

This paper reports three-dimensional atom probe tomography results from a γ/γ′ based Co–Al–W alloy and two quaternary variants of this alloy highlighting the following salient features: (i) sub-nanometer-scale solute partitioning across the γ/γ′ interface as well as solute pile-up at this interface; (ii) the site preference of quaternary elements in γ′ precipitates, Co3(Al, W); and (iii) formation of multiple generations of γ′ precipitates in one of the alloys.