Title
Phase Field Approach To Microstructural Modeling And Life Prediction Of High Temperature Coatings
Abstract
A mechanism-based methodologies to model microstructural evolution and predict lifetime of oxidation resistance coatings and TBCs using phase-field simulation is presented wherein only fundamental properties of materials such as free energy, atomic mobility and elastic constants are employed. Phase field approach to simulate critical phenomena associated with TBC failure, namely sintering of ytrria-stabilized zirconia (YSZ) topcoat, (t′→f+m) phase transformations in YSZ topcoat, high temperature oxidation (i.e., growth of thermally grown oxide, TGO) of bond coats, multicomponent-multiphase interdiffusion between bond coats and superalloy substrate, and fracture at the YSZ/TGO and TGO/bond coat interfaces are presented based on available literature. Results from simulation of microstructure evolution due to multiphase-multicomponent interdiffusion between bond coat and superalloy substrates are highlighted with an emphasis on composition-dependent interdiffusion. Specifically, a phase field model has been utilized to simulate and predict interdiffusion behavior and evolution of microstructure in multi-phase diffusion couples of binary and ternary systems, e.g. Ni-Al and Ni-Cr-Al. The model was capable of predicting composition profiles, diffusion paths and dissolution kinetics of the second phase, which were in good agreement with the experimental results reported in the literature. Copyright © 2009 by ASME.
Publication Date
12-1-2009
Publication Title
Proceedings of the ASME Turbo Expo
Volume
4
Number of Pages
915-924
Document Type
Article; Proceedings Paper
Personal Identifier
scopus
DOI Link
https://doi.org/10.1115/GT2009-60247
Copyright Status
Unknown
Socpus ID
77953176598 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/77953176598
STARS Citation
Mohanty, R. R. and Sohn, Y. H., "Phase Field Approach To Microstructural Modeling And Life Prediction Of High Temperature Coatings" (2009). Scopus Export 2000s. 11389.
https://stars.library.ucf.edu/scopus2000/11389