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Atom-Probe Tomographic Study of ¿/¿' Interfaces and Compositions in an Aged Co-Al-W Superalloy



Eric Lass, Kil-Won Moon, Maureen E. Williams, Carelyn E. Campbell, Ursula R. Kattner, David C. Dunand, Peter J. Bocchini, David N. Seidman


Atom-probe tomography (APT) is utilized to investigate, in a Co-9.7Al-10.8W at.% alloy aged at 900 °C for 1000 h, the phase composition and partitioning behavior of the two-phase ɣ(f.c.c.)/ɣ'(L12) microstructure. The APT composition of the ɣ-matrix (Co-8.97Al-5.69W at.%) agrees well with a previously reported measurement made by energy-dispersive X-ray spectroscopy; however, the composition of the ɣ'(L12) precipitates (Co-10.03Al-12.48W at.%) is slightly richer in W and Al, and leaner in Co. Partitioning coefficients and Al interfacial excess have also been calculated.
Scripta Materialia


¿/¿' Co-based superalloys, Atom-probe tomography, Co-Al-W


Lass, E. , Moon, K. , Williams, M. , Campbell, C. , Kattner, U. , Dunand, D. , Bocchini, P. and Seidman, D. (2012), Atom-Probe Tomographic Study of ¿/¿' Interfaces and Compositions in an Aged Co-Al-W Superalloy, Scripta Materialia, [online], (Accessed June 20, 2024)


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Created December 11, 2012, Updated October 12, 2021