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

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Author(s): Eric Lass; Kil Won Moon; Maureen E. Williams; Carelyn E. Campbell; Ursula R. Kattner; David C. Dunand; Peter J. Bocchini; David N. Seidman;
Title: Atom-Probe Tomographic Study of ¿/¿' Interfaces and Compositions in an Aged Co-Al-W Superalloy
Published: December 12, 2012
Abstract: 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.
Citation: Scripta Materialia
Volume: 68
Pages: 4 pp.
Keywords: ¿/¿' Co-based superalloys; Atom-probe tomography; Co-Al-W
Research Areas: Thermodynamics and kinetics, Advanced Materials
DOI: http://dx.doi.org/10.1016/j.scriptamat.2012.11.035  (Note: May link to a non-U.S. Government webpage)