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The Temporal Evolution of the Nanostructure of a Model Ni-Al-Cr SuperalloyThe early to the later stages of precipitation of ordered gamma'-precipitates (L1(sub 2)) in Ni-5.2 Al-14.2 Cr (at.%) are studied at 873 K. Precipitates with radii as small as 0.45 nm are characterized fully by three-dimensional atom-probe (3DAP) microscopy. Contrary to what is often assumed by theory or in models, the average precipitate composition is shown to evolve with time, such that solute concentrations decrease toward an equilibrium value given by the solvus lines. Power-law time dependencies of the number density, mean radius, and supersaturations of Al and Cr are discussed in light of theoretical predictions for Ostwald ripening.
Document ID
20050198865
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Sudbrack, Chantal K.
(Northwestern Univ. Evanston, IL, United States)
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 23, 2013
Publication Date
January 1, 2004
Publication Information
Publication: TMS Letters
Publisher: Minerals, Metals and Materials Society
Volume: 1
Issue: 2
Subject Category
Metals And Metallic Materials
Report/Patent Number
E-14858
Funding Number(s)
CONTRACT_GRANT: NGT3-52378
CONTRACT_GRANT: NSF DMR-02-41928
WBS: WBS 22-332-12-10-02
Distribution Limits
Public
Copyright
Other

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