| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
Effect of Local Chemical Order on the Irradiation-induced Defect Evolution in Multi-principal Element Alloys |
| Author(s) |
Jun Ding, Zhen Zhang, Chenyang Lu, Robert Ritchie, Evan Ma |
| On-Site Speaker (Planned) |
Jun Ding |
| Abstract Scope |
Multi-principal element alloys (MPEAs) have emerged as potentially suitable structural materials for nuclear applications, particularly as they appear to show promising irradiation resistance. However, the influence of local chemical order (LCO) on the irradiation response of MPEAs has remained uncertain thus far. In this work, we combine ion irradiation experiments with large-scale atomistic simulations to reveal that the presence of LCO, slows down the formation and evolution of point defects in MPEAs during irradiation. In particular, the irradiation-induced vacancies and interstitials exhibit a smaller difference in their mobility, arising from a stronger effect of LCO in localizing interstitial diffusion. This effect promotes their recombination as the LCO serves to tune the migration energy barriers of these point defects, thereby delaying the initiation of damage. These findings imply that local chemical ordering may provide a new variable in the design space to enhance the resistance of MPEAs to irradiation damage. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |