| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
Impact of Ti on Phase Evolution and Oxidation Mechanisms within TiAlTa Alloys |
| Author(s) |
Jaimie Tiley, Yanbo Wang, Soumya Nag, Ercan Cakmak, Raymond Unocic, Pania Newell |
| On-Site Speaker (Planned) |
Jaimie Tiley |
| Abstract Scope |
Meta-stable and heterogenous structures within refractory complex concentrated alloys (RCCAs) provide creative new high temperature materials for extreme environments. One approach involves the development of high temperature B2 phases in BCC RCCAs using Ti and Al additions. Although high temperature stability has been demonstrated in several RCCA material with these elements, there impact on oxidation mechanisms remained largely unknown. This work investigates the impact of Ti composition on phase evolution and oxidation mechanisms in TiAlTa alloys, aimed at understanding the potential for these elements in RCCAs. TiAlTa, 50Ti25Al25Ta, and 70Ti15Al15Ta (atomic %) samples were mechanically tested at room temperature, 250C, 500C, and 750C (in atmosphere) to study oxide film formation and related impacts on strength. TEM and XPS analysis was conducted at ORNL’s Center for Nanophase Materials Science user facility, while SEM, indentation and oxidation studies were conducted at the University of Utah. |
| Proceedings Inclusion? |
Planned: |