About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Advances in Powder and Ceramic Materials Science
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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, |