About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Impacts of Mo and W incorporation on boundary chemistry in (Mo<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>V<sub>0.2</sub>W<sub>0.2</sub>)C high-entropy ceramics |
| Author(s) |
Ben Schauer, Olivia A. Graeve |
| On-Site Speaker (Planned) |
Ben Schauer |
| Abstract Scope |
High entropy ceramics (HECs) are a promising sub-field in ultra-high temperature ceramics. Recent work aims to incorporate elements with electronic bonding properties unlike that of the final, desired HEC structure, such as the incorporation of hexagonal Mo2C and W2C into rock-salt structured (Mo<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>V<sub>0.2</sub>W<sub>0.2</sub>)C. Our work investigates variations in boundary chemistry and character distribution in the aforementioned HEC, sintered from either the single pure phase rock-salt HEC powder, or from powders that include both the rock-salt HEC phase and Mo<sub>2</sub>C and W<sub>2</sub>C phases. Initial findings reveal that grain boundaries in the sintered ceramic fabricated from HEC powder possess greater levels of W segregation. Additionally, the grain boundary character distribution varies significantly between samples. The concentration (measured in percent length) of lower energy special grain boundaries increased measurably in the ceramic prepared from multi-phase powder. These results improve our fundamental understanding of HEC processing. |
| Proceedings Inclusion? |
Planned: |