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Effects of Rhenium Addition on the Temporal Evolution of the Nanostructure and Chemistry of a Model Ni-Cr-Al SuperalloyThe temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at. % Al alloy, with the addition of 2 at.% Re, aged at 1073 K from 0.25 to 264 h, was studied. Transmission electron microscopy and atom-probe tomography were used to measure the number density and mean radius of the gamma prime (L1(sub 2) structure)-precipitates and the chemistry of the gamma prime-precipitates and the gamma (face-centered cubic)-matrix, including the partitioning behavior of all alloying elements between the gamma- and gamma prime-phases and the segregation behavior at gamma/gamma prime interfaces. The precipitates remained spheroidal for an aging time of up to 264 h and, unlike commercial nickel-based superalloys containing Re, there was not confined (nonmonotonic) Re segregation at the gamma/gamma prime interfaces.
Document ID
20070006837
Document Type
Reprint (Version printed in journal)
Authors
Yoon, Kevin E. (Northwestern Univ. Evanston, IL, United States)
Noebe, Ronald D. (NASA Glenn Research Center Cleveland, OH, United States)
Seidman, David N. (Northwestern Univ. Evanston, IL, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2006
Subject Category
Metals and Metallic Materials
Funding Number(s)
CONTRACT_GRANT: NSF DMR-02-41928
WBS: WBS 698671.01.03.17
Distribution Limits
Public
Copyright
Other