| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|
| Presentation Title |
In Situ Ion Irradiation of Gadolinium Titanate: A Perspective on Microstructure and Memory |
| Author(s) |
Jessica A. Krogstad, Nathan Madden, Matthew Janish, James Valdez, Blas Uberuaga |
| On-Site Speaker (Planned) |
Jessica A. Krogstad |
| Abstract Scope |
Defect sinks are key to reducing radiation induced damage accumulation, but not all sinks are created equal. In order to directly compare the relative efficiency of grain boundaries and pore surfaces, unique 3-zone gadolinium titanate (Gd2Ti2O7) specimens capture nanocrystalline, nanoporous and single crystal microstructures within the same TEM lamella. As a result, all three microstructures could be irradiated and observed simultaneously via in situ ion irradiation experiments. Nanobeam electron diffraction was used after specific fluence intervals to assess the crystallinity of each region. The results at room temperature and 600ºC show that a free surface defect sink is more effective than grain boundaries at capturing radiation-induced defects. Additionally, once amorphized the specimens could be recrystallized via in situ heating and then subjected to ion irradiation repeatedly. Repeated cycling between the amorphous and crystalline states revealed that both the recrystallization temperature and amorphization threshold are dependent on the sample history. |