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.

Issue Section:
Technical Papers
Keywords:
platinum alloys, aluminium alloys, thermal expansion, plastic deformation, yield strength, thermal stresses, internal stresses, thermal barrier coatings, martensitic transformations, elastic hysteresis, interface structure
Topics:
Cycles, Martensitic transformations, Phase transitions, Stress, Temperature, Thermal expansion, Yield strength, Thermal barrier coatings, Simulation, Deformation
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Copyright © 2003
 by ASME
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