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Evolution of Surface Morphology of Thermo-Mechanically Cycled NiCoCrAlY Bond Coats
Materials Science & Engineering A
  • J. Shi, University of Delaware
  • Anette M Karlsson, Cleveland State University
  • B. Baufeld, German Aerospace Center
  • M. Bartsch, German Aerospace Center
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We investigate morphological surface instabilities on bond coat surfaces of thermal barrier coatings, induced due to thermo-mechanical loading. Experimental results of hollow circular cylindrical specimens, consisting of a directionally solidified superalloy (IN 100 DS) coated with a NiCoCrAlY bond coat, show that the morphological instabilities are strongly dependent on the load conditions. In particular, the morphological instabilities develop during thermal cycling with a thermal gradient over the cylinder wall, whereas the surface remains smooth for thermal cyclic conditions without a gradient. Furthermore, if a cyclic, axial tensile force is applied (synchronized with the thermal cycling), the morphological instabilities become aligned with the axial direction. We discuss a model, quantified by finite element simulations, capturing this behavior and elucidating the thermo-mechanical response.
Citation Information
Shi, J., Karlsson, A. M., Baufeld, B., 2006, "Evolution of Surface Morphology of Thermo-Mechanically Cycled NiCoCrAlY Bond Coats," Materials Science & Engineering A, 434(1-2) pp. 39-52.