About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Powder and Ceramic Materials Science
|
| Presentation Title |
N-5: TEM Investigation of the Strengthening Effects from Grain Boundary Segregation and Precipitation in W- and W-Mo-containing High-entropy Borides |
| Author(s) |
Huolin Xin, Chunyang Wang |
| On-Site Speaker (Planned) |
Huolin Xin |
| Abstract Scope |
High-entropy borides (HEBs) show drastic strength increases with the additions of WB2 and/or MoB2. By systematically studying the atomic-resolution transmission electron microscopy, electron diffraction, and chemical analysis the origin of this strengthening effect was revealed. W or W-Mo addition in HEBs leads to segregation of these elements at the grain boundaries (GBs) and form W- or W-Mo-rich precipitates along the GBs. Atomic-scale imaging shows that the W- and W-Mo precipitates have a cube-on-cube orientation with the matrix. Nanoindentation tests show simultaneous GB segregation and coherent precipitation provide additional hardening of the HEBs. This work gives a further in-depth understanding of GB segregation and precipitation in HEBs, and suggests that GB engineering could be optimized to improve the performance of high-entropy ceramics. This research was primarily supported by the National Science Foundation Materials Research Science and Engineering Center program through the UC Irvine Center for Complex and Active Materials (DMR-2011967). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Characterization, |