| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Nanocrystalline Refractory Diborides Achieved through Alloying: Mechanical Properties and Thermal Stability |
| Author(s) |
Samyukta Shrivastav, Dana Yun, Kinsey Canova, Laurent Souqui, John Abelson, Jessica A. Krogstad |
| On-Site Speaker (Planned) |
Jessica A. Krogstad |
| Abstract Scope |
Many transition metal dibordies have a unique combination of thermal and mechanical properties. Full manipulation of these properties is often hindered, however, by the exceptionally high temperatures required for full densification, which provides little opportunity for grain size tailoring, especially if fine grains are desired. Here we present a novel low temperature chemical vapor deposition (CVD) pathway to achieve a nanocrystalline hafnium, aluminum diboride thin film with exceptional hardness and thermal stability The degree of crystallinity, and thus the average grain size, appears to be a function of the Al to Hf ratio during the deposition process. Once the nanocrystalline grain size is achieved during deposition, we see little evidence for compositional segregation or grain growth during thermal annealing. Both the composition and nanostructure are unique to this low temperature, environmentally benign CVD process, opening the door to explore additional mixed transition metal diborides and tune for application specific properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Thin Films and Interfaces |