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- Title
Oxide-Assisted Degradation of Ni-Base Single Crystals During Cyclic Loading: the Role of Coatings.
- Authors
Pollock, Tresa M.; Laux, Britta; Brundidge, Clinique L.; Suzuki, Akane; He, Ming Y.
- Abstract
The role of oxidation-induced layers in the failure process of aluminide-coated nickel base single crystals subject to high-temperature fatigue cycling has been investigated experimentally and via finite element analysis. Isothermal strain-controlled compressive fatigue experiments (R5=-∞) with 120 s holds in compression were conducted at 9821 and 10931C. Surfaceinitiated cracks containing a layer of alumina progressively grew through the coating layers into the superalloy substrate, ultimately causing failure. Growth stresses in the oxide provided a driving force for extension of the oxide into the softer coating and substrate layers. Finite element modeling shows the rate of growth of the oxide-filled cracks is sensitive to the strength of the constituent layers and the magnitude of the oxide growth strains. Implications for design of failure-resistant coating-substrate systems are discussed.
- Subjects
OXIDATION; NICKEL; CRYSTALS; HIGH temperatures; FINITE element method
- Publication
Journal of the American Ceramic Society, 2011, Vol 94, ps136
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2011.04578.x