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Abstract The partitioning behavior of tungsten is studied in two dilute Al-Er-W and Al-Zr-W alloys aged isochronally up to 400 and 475 °C, to form L12-structured Al3Er and Al3Zr nanoprecipitates. Atom-probe… Click to show full abstract
Abstract The partitioning behavior of tungsten is studied in two dilute Al-Er-W and Al-Zr-W alloys aged isochronally up to 400 and 475 °C, to form L12-structured Al3Er and Al3Zr nanoprecipitates. Atom-probe tomography reveals low W solubility in the Al3Er and Al3Zr nanoprecipitates (0.071 and 0.234 at.%, respectively) and very low W solubility in the Al matrix (0.057 and 0.023 at.%, respectively), corresponding to precipitate/matrix partitioning ratios of ∼1–10. First-principles calculations demonstrate that the formation energies of substitutional W atoms in the L12 lattices are high and positive (0.66–1.73 eV.atom−1), consistent with the small W solubilities measured experimentally in these nanoprecipitates.
Journal Title: Journal of Alloys and Compounds
Year Published: 2020
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