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On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats
Surface and Coatings Technology
  • S. Darzens, University of Delaware
  • Anette M Karlsson, Cleveland State University
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A numerical procedure for simulating the distortions exhibited by a thermally grown oxide (TGO) upon temperature cycling has been adapted to incorporate the microstructure of the bond coat. The focus is on the dual phase β/γ′ microstructure that develops upon oxidation of a system with a Pt-aluminide bond coat. The results reveal that the presence of the γ′-phase next to the TGO reduces its distortion locally, because of the superior high-temperature strength of γ′, relative to β. Conversely, in regions where the β-phase exists adjacent to the TGO, it distorts and the TGO propagates downward, while simultaneously lengthening. These results from the simulations are in direct correspondence with experimental observations.

Presented at 30th International Conference on Metallurgical Coatings and Thin Films, San Diego, CA., April 28 - May 2, 2003.

Citation Information
Darzens, S., and Karlsson, A. M., 2004, "On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats," Surface and Coatings Technology, 177-178pp. 108-112.