About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Toughening of TiO2 via Femtosecond Laser Shock Peening |
| Author(s) |
Yifan Zhang, Anish Bajla, Shubha Majumder, Subah Mubassira, Ke Xu, Xuanyu Sheng, Joshua A. Medina, Het Jani, Colin McMillen, Luiz G. Jacobsohn, Haiyan Wang, Xinghang Zhang, Shuozhi Xu, Xin Zhao |
| On-Site Speaker (Planned) |
Yifan Zhang |
| Abstract Scope |
Most ceramics have low fracture toughness (<5 MPa√𝑚) at room temperature. This work explores the feasibility of toughening TiO₂ via femtosecond laser shock peening (fs-LSP). Transmission electron microscopy (TEM) analyses reveal LSP-induced the creation of high-density stacking faults, dislocation structures, and twin boundaries in single-crystal TiO₂. Meanwhile, oxygen vacancies were introduced into TiO₂ via the LSP treatment, as evidenced by red peak shifts in Raman spectra. Additionally, X-ray diffraction scans show in-plane compressive residual stress (70-345 MPa) built in TiO₂. The indentation fracture resistance (KIFR) of TiO₂ is enhanced from 2.7 MPa√m to 6.8-8.2 MPa√m. This study demonstrates the remarkable synergistic effect of defect networks and residual compressive stress in toughening TiO₂ and possibly other ceramic materials. Our work also qualifies the fs-LSP as an effective and scalable method to toughen ceramic materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |