THIS GRANT IS A CONTINUATION OF N00014-14-1-0618
Abstract
The proposed program will build on the extensive knowledge base for the layered systems composed of a nickel base single crystal / NiAl bond coating / alumina thermally grown oxide / yttria-stabilized thermal barrier. A broad range of bond coat composition and property space will be explored using pre-existing combinatorial suites of samples to examine (1) oxide growth strains and their spatial heterogeneity, (2) BC/TGO interfacial toughness and TGO toughness and (3) three dimensional aspects of the multilayered coating structure that result in early initiation of failure during thermal and thermomechanical cycling. New insights will be incorporated into micromechanical models that predict cyclic life. It is anticipated that the models and new experimental techniques will have broad applicability beyond the systems investigated experimentally in the proposed program. Anticipated outcomes of the research include: (i) new quantitative information on stresses in the oxides that form on intermetallic bond coatings across a wide spectrum of composition (ii) three dimensional information on the aspects of layer structure and its evolution and the associated mechanisms responsible for early failure during thermal and thermomechanical cycling, (iii) a new femtosecond laser-based technique for rapidassessment interface toughness that will have broad applicability to systems that contain oxide interlayers, new strategies for the design of durable multilayered coating systems.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141612703
Entities
People
- Tresa M. Pollock
Organizations
- Office of Naval Research
- United States Navy
- University of California, Santa Barbara