Abstract
A methodology for determining the preferred site occupancy of various alloying elements within ordered γ′ precipitates was developed and applied to Rene88 samples. The method utilized atom probe tomography and X-ray diffraction techniques with controlled monochromated synchrotron beams to determine element positions. Samples were solutionized at 1423 K (1150 °C) for 30 minutes and cooled at 24 K/min with subsequent aging at 1033 K (760 °C). The synchrotron X-ray diffraction results indicate that niobium prefers to reside on the aluminum sublattice site of the γ′ phase. Additionally, the results indicate that chromium prefers the nickel sublattice sites, while cobalt is likely to occupy both the aluminum and nickel sublattice sites. The X-ray results on the chromium occupancy disagree with atom probe results from the same alloy that indicate that chromium prefers the aluminum sublattice sites.
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Acknowledgments
Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The authors greatly appreciate technical help from M. Lucas and E. Karapetrova in conducting the synchrotron X-ray experiments. Work at the Air Force Research Laboratory was supported by on-site contract No. FA8650-10-D-5226 conducted through UES, Inc., Dayton, Ohio, and by the Institute for Science and Engineering Simulation (ISES) under contract No. FA8650-08-C-5226.
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Manuscript submitted May 7, 2012.
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Tiley, J.S., Senkov, O., Viswanathan, G. et al. A Methodology for Determination of γ′ Site Occupancies in Nickel Superalloys Using Atom Probe Tomography and X-ray Diffraction. Metall Mater Trans A 44, 31–38 (2013). https://doi.org/10.1007/s11661-012-1456-2
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DOI: https://doi.org/10.1007/s11661-012-1456-2