Chromium and tantalum site substitution patterns in Ni3 Al (L 12) γ′ -precipitates

Christopher Booth-Morrison; Zugang Mao; Ronald D. Noebe; David N. Seidman

doi:10.1063/1.2956398

Chromium and tantalum site substitution patterns in Ni3 Al (L 12) γ′ -precipitates

Christopher Booth-Morrison^*, Zugang Mao, Ronald D. Noebe, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

92 Scopus citations

Abstract

The site substitution behavior of Cr and Ta in the Ni3 Al (L 12) -type γ′ -precipitates of a Ni-Al-Cr-Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the γ′ -phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the γ′ -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 γ′ -precipitates, altering the elemental phase partitioning behavior of the Ni-Al-Cr-Ta alloy.

Original language	English (US)
Article number	033103
Journal	Applied Physics Letters
Volume	93
Issue number	3
DOIs	https://doi.org/10.1063/1.2956398
State	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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@article{9a8dee88380e4c04a8fb1da8f3efce44,

title = "Chromium and tantalum site substitution patterns in Ni3 Al (L 12) γ′ -precipitates",

abstract = "The site substitution behavior of Cr and Ta in the Ni3 Al (L 12) -type γ′ -precipitates of a Ni-Al-Cr-Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the γ′ -phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the γ′ -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 γ′ -precipitates, altering the elemental phase partitioning behavior of the Ni-Al-Cr-Ta alloy.",

author = "Christopher Booth-Morrison and Zugang Mao and Noebe, {Ronald D.} and Seidman, {David N.}",

note = "Funding Information: This research was supported by the National Science Foundation (NSF) under Grant No. DMR-080461, Dr. H. Chopra, grant officer. APT measurements were performed at the Northwestern University Center for Atom-probe tomography (NUCAPT). Research Assistant Professor D. Isheim is thanked for managing NUCAPT. The LEAP{\texttrademark} tomograph was purchased with funding from the NSF-MRI (Grant No. DMR 0420532, Dr. C. Bouldin, grant officer) and ONR-DURIP (Grant Nos. N00014-0400798 and N00014-0610539, Dr. J. Christodoulou, grant officer) programs. We thank Professor C. Wolverton for discussions.",

year = "2008",

doi = "10.1063/1.2956398",

language = "English (US)",

volume = "93",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "3",

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T1 - Chromium and tantalum site substitution patterns in Ni3 Al (L 12) γ′ -precipitates

AU - Booth-Morrison, Christopher

AU - Mao, Zugang

AU - Noebe, Ronald D.

AU - Seidman, David N.

N1 - Funding Information: This research was supported by the National Science Foundation (NSF) under Grant No. DMR-080461, Dr. H. Chopra, grant officer. APT measurements were performed at the Northwestern University Center for Atom-probe tomography (NUCAPT). Research Assistant Professor D. Isheim is thanked for managing NUCAPT. The LEAP™ tomograph was purchased with funding from the NSF-MRI (Grant No. DMR 0420532, Dr. C. Bouldin, grant officer) and ONR-DURIP (Grant Nos. N00014-0400798 and N00014-0610539, Dr. J. Christodoulou, grant officer) programs. We thank Professor C. Wolverton for discussions.

PY - 2008

Y1 - 2008

N2 - The site substitution behavior of Cr and Ta in the Ni3 Al (L 12) -type γ′ -precipitates of a Ni-Al-Cr-Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the γ′ -phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the γ′ -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 γ′ -precipitates, altering the elemental phase partitioning behavior of the Ni-Al-Cr-Ta alloy.

AB - The site substitution behavior of Cr and Ta in the Ni3 Al (L 12) -type γ′ -precipitates of a Ni-Al-Cr-Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the γ′ -phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the γ′ -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 γ′ -precipitates, altering the elemental phase partitioning behavior of the Ni-Al-Cr-Ta alloy.

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DO - 10.1063/1.2956398

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JF - Applied Physics Letters

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ER -

Chromium and tantalum site substitution patterns in Ni3 Al (L 12) γ′ -precipitates

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