About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Interface-Driven Ordering in High-Entropy Ceramics and 2D MXenes |
| Author(s) |
Babak Anasori |
| On-Site Speaker (Planned) |
Babak Anasori |
| Abstract Scope |
The effects of interfaces and grain boundaries on the enthalpic preference for ordering and atomic site occupancies remain less understood in high-entropy ceramics. To evaluate this, we studied ceramics at ~1-nm thicknesses, where surface atoms match or exceed core atoms. We used layered MAX phases, where every four metal layers are separated by aluminum (i.e., –Al–M'–C–M"–C–M"–C–M'–Al–), as our highly interfaced system. In this structure, M' atoms sit at interfaces with dissimilar neighbors, while M" atoms are in the core with similar ones. We synthesized ~40 compositions of M<sub>4</sub>AlC<sub>3</sub> with two to nine metals and found that at least seven metals are needed to overcome enthalpic ordering and induce entropy-driven disorder, more than in bulk high-entropy ceramics. We will also present results on 2D MXenes derived from these phases and discuss their entropy-driven stabilization and properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, High-Entropy Alloys, Thin Films and Interfaces |