Title: Evolution of surface morphology of thermo-mechanically cycled NiCoCrAlY bond coats
Authors: Shi, J ×
Karlsson, A. M
Baufeld, Bernd
Bartsch, M #
Issue Date: Oct-2006
Publisher: Elsevier science sa
Series Title: Materials science and engineering a-structural materials properties microstructure and processing vol:434 issue:1-2 pages:39-52
Abstract: 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. (c) 2006 Elsevier B.V. All rights reserved.
ISSN: 0921-5093
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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