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Meeting MS&T23: Materials Science & Technology
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Oxidation of B2-(Ru,Pd)Al Alloys for Bond Coat Applications
Author(s) Yueh-Cheng Yu, David Poerschke
On-Site Speaker (Planned) Yueh-Cheng Yu
Abstract Scope A series of B2-(Ru,Pd)Al alloys with varied Ru:Pd ratio between RuAl and PdAl were prepared by arc melting and annealing. Their performance as prospective bond coat materials for high-temperature applications was examined by oxidation testing in dry air at 1300 C. The composition with pure Ru (i.e., Ru50Al50; the subscripts denote atomic percentage) exhibits limited protection in oxidizing environment due to the formation of alternating Al2O3/Ru layers. Addition of Pd to RuAl, even with a low concentration, significantly alters the oxidation behavior. Both Ru45Pd5Al50 and Ru35Pd15Al50 generate single-layer Al2O3 TGO, although Ru35Pd15Al50 better suppresses pore formation under TGO due to faster Al replenishment under the surface. For the Pd-rich compositions and pure B2-PdAl, TGO spallation and inward oxidation through cracks were observed, implying non-stable B2 phases and larger mismatch in thermal expansion.

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Discovery of High Entropy Rare Earth Disilicates for Extreme Environments
Effect of Gaseous Environments and Alloy/Coatings Composition on the Mixed Deposit-induced Degradation of Advanced Alloys/Coatings
Effect of Temperature and Impurities on the Oxidation Behavior of Ni-based Alloys in Hot CO2-rich Gases
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Evaluating Corrosivity of Molten Salts Using Halide Optical Basicity Index
Evolution of Interfacial Morphogenesis and Stability of Alloys in Harsh Environments
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Oxidation and Hot Corrosion Performance of Fe-Cr-Ni Based Alloys
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Oxidation of B2-(Ru,Pd)Al Alloys for Bond Coat Applications
Solid Particle Erosion of Ceramic Matrix Composites and Environmental Barrier Coatings: Current Progress and Future Direction
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