期刊
ACTA MATERIALIA
卷 59, 期 17, 页码 6729-6742出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.07.030
关键词
Nickel-based superalloys; Freckles; Atom-probe tomography; Directional solidification
资金
- MEANS II AFOSR [FA9550-05-1-0089]
- European Community
- PCC Airfoils
- University of California, Santa Barbara
- University of Michigan, Ann Arbor
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
Freckles are misoriented defects formed during the solidification of single-crystal (SC) nickel-based superalloys, which are used for turbine blades in jet engines and power generators. Freckles can cause degradation in a turbine blade's mechanical properties at high temperatures, and their elimination is of prime technological importance. Employing atom-probe tomography (APT), analytical transmission electron microscopy and dual-beam focused ion-beam microscopy, the chemical compositions of dendritic cores and inter-dendritic regions for both the freckles and the base material in a multicomponent Ni-based alloy are analyzed. The densities of four liquid-compounds with the same compositions measured using APT are calculated, and it is demonstrated that the inter-dendritic liquids have considerably smaller densities than liquids with compositions the same as the dendritic cores. The latter serves as a quantitative measure for the likelihood of freckle formation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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