| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
Nb2TiO7 as a Protective Oxide for Refractory Alloys |
| Author(s) |
Elizabeth J. Opila, Charlie Brandenburg, Brandol Galicia, Hailey Boyd, Mitra Taheri |
| On-Site Speaker (Planned) |
Elizabeth J. Opila |
| Abstract Scope |
Oxidation of NbTiZr refractory alloys are being studied as a model for refractory multiple principal element alloys (RMPEA). Oxidation of equimolar NbTiZr at temperatures between 900 and 1200C resulted in the formation of TiO2 and Nb2TiO7 surface oxides. In the 1960s, alloy B-1 (Nb-15Ti-10Ta-10W-3Al-2Hf, in wt%) was identified as a relatively oxidation resistant Nb-base alloy and it was hypothesized that the formation of Nb2TiO7 offered some protection. In this study oxidation kinetics of equimolar NbTiZr, C-103, and alloy B-1 are compared under the same conditions. In addition, the complex oxide Nb2TiO7 was synthesized from constituent oxides by spark plasma sintering to characterize properties important for protective thermally grown oxides including melting temperature and thermal expansion coefficient. The goal of this work is to contribute to our understanding of Nb- and Ti-containing RMPEA oxidation mechanisms. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |