About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Advanced Characterization of High-temperature Oxide Evolution in NbTiZr |
Author(s) |
David Beaudry, Daniel Foley, Elaf Anber, Jean-Philippe Couzinié, Loïc Perrière, Michael Waters, James Rondinelli, Christopher Pasco, Tyrel McQueen, Keith Knipling, Mitra Taheri |
On-Site Speaker (Planned) |
David Beaudry |
Abstract Scope |
Refractory High Entropy Alloys (RHEAs) offer a potential alternative to Ni-based superalloys in high-temperature turbine applications because of their specific strength at elevated temperatures. These alloys often undergo detrimental oxidation behavior due to their constituent refractory elements. Many RHEA compositions exhibit phase transformations that can both influence and be influenced by oxygen diffusion into the bulk. To better understand the fundamental oxide formation and evolution in these systems, a common derivative of studied RHEAs, NbTiZr, was selected for oxidation at 1050°C. A multi-layered surface microstructure formed with uniformity throughout each layer. High Resolution TEM and APT revealed that the oxygen influx stabilized a low-temperature phase transformation, resulting in two metallic phases with distinct oxygen content. The interplay of these oxygen-stabilized phases with oxide precipitation at their interface offers a novel “bottom-up” approach of high-throughput studies on altering bulk oxidation via doping to tune phase transformations at the bulk-oxide interface. |
Proceedings Inclusion? |
Undecided |