期刊
ACTA MATERIALIA
卷 58, 期 18, 页码 5898-5911出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.07.004
关键词
Ni-based superalloys; Partitioning ratio, Tungsten, Atom probe tomography, First-principles calculations
资金
- MEANS II AFOSR [FA9550-05-1-0089]
- National Science Foundation (NSF) [DMR-0804610]
- European community
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
Atom probe tomography (APT) and first-principles calculations are implemented to study the partitioning of W to the gamma (face-centered cubic)- and gamma' (LI2)-phases in Ni-based alloys. APT observations indicate that whereas W partitions preferentially to the gamma'-phase in a ternary Ni-Al-W alloy, its partitioning behavior is reversed in favor of the gamma-phase in multi-component alloys. Furthermore, the degree of W-partitioning to the gamma'-phase decreases with the addition of Ta to a Ni-Al-Cr-W alloy, a trend which is consistent with Thermo-Calc simulations First-principles calculations of the substitutional formation energies of W and Ta at 0 K predict that both elements prefer energetically sharing the Al-sublattice sites of the gamma'-phase, whereas Ta has a larger tendency to partition to the gamma'-phase than does W. This implies that Ta displaces W from the gamma'-phase Into the gamma-phase in multi-component Ni-based alloys. (C) 2010 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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