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

Research output: Contribution to journalArticlepeer-review

71 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 languageEnglish (US)
Article number033103
JournalApplied Physics Letters
Volume93
Issue number3
DOIs
StatePublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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