期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 820, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.153383
关键词
Aluminum alloys; Zirconium; Scandium; Tungsten; Atom-probe tomography
资金
- Office of Naval Research [N00014-18-1-2550]
- NSF-MRI program [DMR-0420532]
- ONR-DURIP program [N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- SHyNE Resource [NSF ECCS-1542205]
- Initiative for Sustainability and Energy (ISEN) at Northwestern University
- MRSEC Program of the Materials Research Center at Northwestern University [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- State of Illinois, through the IIN
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 degrees C, to form L1(2)-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 similar to 1-10. First-principles calculations demonstrate that the formation energies of substitutional W atoms in the L1(2) lattices are high and positive (0.66 - 1.73 eV.atom(-1)), consistent with the small W solubilities measured experimentally in these nanoprecipitates. (C) 2019 Elsevier B.V. All rights reserved.
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