Chromium and tantalum site substitution patterns in Ni3Al(L12) γ′-precipitates

@inproceedings{BoothMorrison2008ChromiumAT,
  title={Chromium and tantalum site substitution patterns in Ni3Al(L12) γ′-precipitates},
  author={Christopher Booth-Morrison and Zugang Mao and Ronald D. Noebe and David N. Seidman},
  year={2008}
}
The site substitution behavior of Cr and Ta in the Ni3Al(L12)-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… CONTINUE READING

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