| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
In Situ TEM Observation of Complex Irradiation-Driven Interface Amorphization and Amorphization-Driven Grain Reorientation at Immiscible Cu – Ta Interfaces |
| Author(s) |
Soumita Mondal, Priyam Patki, Arya Chatterjee, Wei-Ying Chen, Janelle P. Wharry |
| On-Site Speaker (Planned) |
Soumita Mondal |
| Abstract Scope |
The objective of this talk is to elucidate the underlying micromechanisms of extreme irradiation tolerance of nanocrystalline Cu–Ta alloy. Multiple in situ transmission electron microscope ion irradiations were performed in the IVEM Tandem facility on an immiscible Cu-10Ta (at%) alloy with systematic variations in Ne+, Kr2+, and Xe2+ ions at temperatures ranging between 100-400 °C to a total dose of 10 dpa. The microstructure revealed good thermal stability with negligible grain/phase size growth during irradiation. Irradiation-induced cavities (voids and/or bubbles) were a precursor to subsequent formation of an amorphous interfacial boundary between the immiscible Cu and Ta phases. The onset doses of cavity formation and amorphization were dependent on cascade size and temperature. However, increase in free volume due to amorphization causes reorientation of adjacent grains/subgrains due to generation of compressive stresses. This study sheds light on the complex and often competing processes stabilizing immiscible phases under irradiation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, |