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Meeting Materials Science & Technology 2020
Symposium Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
Presentation Title Anisotropy at Interfaces in Rare-earth Pyrosilicates for High-temperature Coatings
Author(s) Hadas Sternlicht, Nitin Padture
On-Site Speaker (Planned) Hadas Sternlicht
Abstract Scope Environmental barrier coatings (EBCs) are used to protect ceramic matrix composites (CMCs) used in the hot section of gas turbine engines against oxidation, and have to be resistant to attack of calcia-magnesia-alumino-silicate (CMAS) glass from the atmosphere, which can lead to premature failure of the coatings. In this work electron microscopy characterization of the anisotropy in the CMAS- EBCs reaction will be discussed, focusing on grain boundaries and phase boundaries. The presence of line defects, such as disconnections (which can have both a step and a dislocation component) will be discussed in light of the interaction with the glass. In addition, the chemistry of phase boundaries will be partially evaluated. The tendency of such phase boundaries to be located along different grain boundaries will be discussed, as well as how the interaction with the glass affects it.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Survey of Constrained Grain Boundary Migration Mechanisms
Advanced TEM of Interfaces and Defects in Functional Ceramics
Anisotropy at Interfaces in Rare-earth Pyrosilicates for High-temperature Coatings
Effect of Electrode Composition and Potential on Moisture Incorporation and Degradation in Dielectrics and Piezoelectrics
Electromigration-induced Defects' Evolution in Polycrystalline Interconnects: Insights from Phase-field Simulations
Equilibrium and Kinetic Shapes of Grains in Polycrystals
Grain Boundary Engineering ZnAl2O4 via Rare Earth (RE) Doping with Varying Ionic Radii
Implications of Ferroelectricity in Perovskite Solar Cells
Phase Stability of Sr1-xBaxMnO3 (0 ≤ x ≤ 0.5) Films Using Combinatorial Substrate Epitaxy
Relating Grain Size Distributions and Grain Boundary Excess Coverages to Complexion Transitions in Eu-doped MgAl2O4
The Impact of Metastable Grain Boundary States on Mobility in FCC Metal
Thermal Property of Diamond Thin Film on Si (100) Substrate
Vacancy-enhanced Grain Boundary Migration

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