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Chromium and Tantalum Site Substitution Patterns in Ni3Al (L1(sub 2))gamma(prime)- PrecipitatesThe site substitution behavior of Cr and Ta in the Ni3Al (Ll2)-type gamma'-precipitates of a Ni-Al-Cr-Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the gamma'-phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the gamma'-precipitates. The calculated substitutional energies of the solute atoms at the Ni and Al sublattice sites indicate that Ta has a strong preference for the Al sites, while Cr has a weak Al site preference. Furthermore, Ta is shown to replace Cr at the Al sublattice sites of the gamma'-precipitates, altering the elemental phase partitioning behavior of the Ni-Al-Cr-Ta alloy.
Document ID
20090007809
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Booth-Morrison, Christopher
(Northwestern Univ. Evanston, IL, United States)
Mao, Zugang
(Northwestern Univ. Evanston, IL, United States)
Seidman, David N.
(Northwestern Univ. Evanston, IL, United States)
Noebe, Ronald D.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
July 21, 2008
Publication Information
Publication: Applied Physics Letters
Publisher: American Inst. of Physics
Volume: 93
Issue: 33103
Subject Category
Metals And Metallic Materials
Report/Patent Number
E-16902
Funding Number(s)
CONTRACT_GRANT: N00014-0610539
CONTRACT_GRANT: DMR-080461
CONTRACT_GRANT: DMR-0420532
CONTRACT_GRANT: N00014-0400798
Distribution Limits
Public
Copyright
Other

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