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 mertensitic transformation significantly influences the development of stresses and strains in TBC systems.
Influence of Martensitic Transformation on the Durability of TBC Systems (Invited)
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Chen, MW, Glynn, ML, Pan, D, Ramesh, KT, Hemker, KJ, Ott, RT, & Hufnagel, TC. "Influence of Martensitic Transformation on the Durability of TBC Systems (Invited)." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Aerospace. Washington, DC, USA. November 15–21, 2003. pp. 489-495. ASME. https://doi.org/10.1115/IMECE2003-43203
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