Abstract
Microstructural evolution of bond coat with thermal cycling was characterized with transmission electron microscopy (TEM) and high temperature X-ray diffraction (HT-XRD) analysis. Before thermal cycling, the structure of asfabricated bond coat was confirmed to be a long-range ordered B2 β-phase. After thermal cycling to ∼28 % of the cyclic life, the bond coat was found to transform into a Nirich L10 martensite (M) from its original B2 structure. The transformations, M ↔ B2, were demonstrated to be reversible and to occur on heating and cooling in each cycle. Quantitative high temperature XRD measurements verified the phase transformations produce about 0.7% transformation strain. Finite element calculations incorporating the transformation strain indicate that the martensitic transformation significantly influences the development of stresses and strains in TBC systems.
Original language | English |
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Pages (from-to) | 489-495 |
Number of pages | 7 |
Journal | American Society of Mechanical Engineers, Aerospace Division (Publication) AD |
Volume | 68 |
DOIs | |
Publication status | Published - 2003 Jan 1 |
Event | 2003 ASME International Mechanical Engineering Congress - Washington, DC., United States Duration: 2003 Nov 15 → 2003 Nov 21 |
Keywords
- Bond coat
- Martensitic transformation
- Thermal barrier coatings (TBCs)
- Transformation strain
ASJC Scopus subject areas
- Mechanical Engineering
- Space and Planetary Science