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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Hume-Rothery Award Symposium: Computational Thermodynamics and Its Implications to Kinetics, Properties, and Materials Design
Presentation Title The Application of Computational Thermodynamics to Design Reactive-element Doped High-temperature Alloys: Hf Additions to NiCrAl
Author(s) Brian Gleeson, Thomas Gheno, Austin Ross, Zi-Kui Liu
On-Site Speaker (Planned) Brian Gleeson
Abstract Scope Reactive element (RE) additions to high-temperature materials are a widespread method of improving their oxidation resistance. Most common dopants include Y, Hf and Zr in alumina-forming systems, Ce and La in chromia-forming systems. Their influence on oxidation behavior takes multiple forms. In particular, REs are known to yield significantly slower scale growth and improved scale adherence. However, as beneficial as REs may be when added in the right proportion, over-doping can result in much lower resistance than that of an undoped alloy. To this end, computational thermodynamics is shown to be a valuable tool in integrating experimental data and predicting phase equilibria. Specifically, calculated and experimental results relative to the oxidation of Hf-doped NiCrAl alloys are presented and useful “Hf-tolerance” diagrams are established. This presentation will also highlight insights into aspects of high-temperature oxidation that stem from a longstanding collaboration with Professor Zi-Kui Liu.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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