| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Superior Radiation Resistance and Structural Stability in Nanotwinned High Entropy Thin Film under Extreme Radiation Damage |
| Author(s) |
Wei-Cheng Chang, Fan-Yi Ouyang, Maulik Patel |
| On-Site Speaker (Planned) |
Wei-Cheng Chang |
| Abstract Scope |
This study demonstrated that high entropy alloy (HEA) thin films with a high density of nanotwinned (NT) structure can exhibit exceptional radiation resistance compared to conventional metallic alloys and nanocrystalline thin films. Using a pulsed direct current sputtering system, the CoCrFeNi HEA NT thin films were deposited and their corresponding resistance to radiation damage was investigated. Small-sized helium bubbles and their distribution indicated significant radiation resistance in this system; however, transmission electron microscopy and x-ray diffractometry analysis revealed that the thin film maintained stable grain and twin microstructure after radiation exposure. The interactions between defects, grain, and nanotwinned boundaries were also observed. The HEA NT thin films also transformed from a face-centered cubic phase to a hexagonal closed-packed phase due to radiation-induced local strain. The substantial local strain also induced grain rotation within the thin film structure. The detailed corresponding mechanism will be discussed in detail. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, Thin Films and Interfaces |