| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Irradiation-induced Athermal Crystallization in Nanostructured Amorphous Ceramics |
| Author(s) |
Janelle P. Wharry, Hui Xiong, Tristan Olsen, Cyrus Koroni, Chao Yang, Min Lun Lau, Dewen Hou, Zhongxia Shang, Md Ali Muntaha, Khalid Hattar, Wei-Ying Chen, Min Long |
| On-Site Speaker (Planned) |
Janelle P. Wharry |
| Abstract Scope |
This talk presents athermal irradiation-induced amorphous-to-crystalline (a-to-c) transformations in nanostructured ceramics. Irradiation is generally thought to introduce disorder into materials; in fact, irradiation-induced amorphization of ordered ceramics has been widely documented. But there is growing evidence that irradiation can create order, particularly through a-to-c transformations which occur athermally, i.e., well below the crystallization temperatures. These transformations are understood only through phenomenological theories, and have not previously been studied systematically. Here, we present observations of irradiation-induced a-to-c transformations in titania (TiO2) nanotubes, using systematic variations of irradiating ion mass (Kr, Xe, Au) and energy (46 keV through 1 MeV). We attribute the extent of a-to-c transformation to increasing nuclear to electronic stopping power ratios. The irradiation-induced nanocrystallites exhibit unusual crystalline structures not typically accessible through thermal annealing alone. We also reveal extreme nanotube bending during a-to-c transformation, presenting a pathway for engineering mechanical resilience into brittle nanostructured ceramics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Nanotechnology, Ceramics |