Abstract
The partitioning behavior and sublattice site preference of Re or Ru in the Ni3Al(L12) γ′ - precipitates of model Ni-Al-Cr alloys are investigated by atom-probe tomography (APT) and first-principles calculations. Rhenium and Ru are experimentally observed to partition to the γ (fcc)-phase, which is consistent with the smaller values of the γ-matrix Re and Ru substitutional formation energies determined by first-principles calculations. APT measurements of the γ′-precipitate composition indicate that Re and Ru occupy the Al sublattice sites of the Ni3Al(L12) phase. The preferential site substitution of Re and Ru at Al sublattice sites is confirmed by first-principles calculations.
| Original language | English (US) |
|---|---|
| Article number | 171905 |
| Journal | Applied Physics Letters |
| Volume | 93 |
| Issue number | 17 |
| DOIs | |
| State | Published - 2008 |
Funding
This research was supported by the National Science Foundation (NSF) under Grant No. DMR-0804610. APT measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). Research assistant Professor D. Isheim is kindly 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). We thank Dr. R. D. Noebe of the NASA Glenn Research Center for alloy preparation.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)