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Type Booth-Morrison, Christopher; Mao, Zugang; Noebe, Ronald D.; Seidman, David N.
  Publication Chromium and tantalum site substitution patterns in Ni3Al (L1[sub:2]) [gamma]’-precipitates Volume Journal Article
Pages 2008
  Abstract Applied Physics Letters  
  Corporate Author App. Phys. Let.  
Publisher 93  
  Summary Language 033103 Series Editor Nickel-based superalloys; Site substitution; Atom-probe tomography; Tantalum; Nanostructures, First-principles calculations  
Abbreviated Series Title The site substitution behavior of Cr and Ta in the Ni3Al (L12)-type gamma[prime]-precipitates of a Ni–Al–Cr–Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the gamma[prime]-phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the gamma[prime]-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[prime]-precipitates, altering the elemental phase partitioning behavior of the Ni–Al–Cr–Ta alloy.
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no NU @ m-krug @ ; NU @ c-booth @ 10296
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