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

This paper reports three-dimensional atom probe tomography results from a gamma/gamma' 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 gamma/gamma' interface as well as solute pile-up at this interface; (ii) the site preference of quaternary elements in gamma' precipitates, Co-3(Al, W); and (iii) formation of multiple generations of gamma' precipitates in one of the alloys. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.