| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Self-Patterned Metal Carbide - Amorphous Ceramics Nanostructure Enabled High Temperature Strength and Plasticity and Irradiation Resistance |
| Author(s) |
Jian Wang, Bingqiang Wei, Lin Shao, Nan Li, Lin Li |
| On-Site Speaker (Planned) |
Jian Wang |
| Abstract Scope |
Amorphous ceramics and metal carbides exhibit superb strength but poor plasticity, which limit their applications as structural materials under extreme environments. Here, we synthesized dual-phase nanocomposites that embedded nanosized metal carbide TiC in amorphous ceramic matrix SiOC by co-sputtering deposition followed by high temperature annealing and/or irradiation. In-situ SEM micropillar compression tests demonstrated that the self-patterned TiC-SiOC nanocomposites exhibit high strength and good compressive plasticity, 7 GPa at room temperature and 3.5 GPa at 700 ℃ with uniform strain larger than 10%. More importantly, TiC-SiOC nanocomposites show good irradiation resistance and more uniform plastic deformation after irradiation. The synergism between the shearing of amorphous ceramic and the rotation of nanosized metal carbides accommodates plastic deformation of TiC-SiOC nanocomposites, while nanosized TiCs inhibit the propagation of shear banding formed in amorphous SiOC. Moreover, amorphous ceramic matrix and amorphous-crystal interfaces act as strong sinks to manage irradiation-induced defects. |
| Proceedings Inclusion? |
Planned: |