Recent studies have shown that Pt-aluminide—a common bond coat material in thermal barrier coatings—undergoes martensitic transformations during thermal cycling. The transformations are associated with both large transformation strain and a strain hysteresis, leading to accumulation of a mismatch strain. Thermal barrier systems based on Pt-aluminide bond coats are susceptible to interfacial morphological instabilities. In this study, we investigate how the cyclic martensitic transformation influences the morphology. Two key results are: (i) the morphological instabilities are highly sensitive to the thermo-mechanical properties of the substrate due to the martensitic transformation; (ii) the hysteresis associated with cyclic martensitic transformation cannot drive the morphological instabilities; the strains associated with the formation of the thermally grown oxide do.
On the Mechanical Response in a Thermal Barrier System Due to Martensitic Phase Transformation in the Bond Coat
Contributed by the Heat Transfer Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Heat Transfer Division December 15, 2002; revision received June 17, 2003. Associate Editor: A. Pelegri.
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Karlsson, A. M. (September 22, 2003). "On the Mechanical Response in a Thermal Barrier System Due to Martensitic Phase Transformation in the Bond Coat ." ASME. J. Eng. Mater. Technol. October 2003; 125(4): 346–352. https://doi.org/10.1115/1.1605107
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