About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Local Chemical Ordering Around Extended Defects in High-Entropy Alloys |
| Author(s) |
Shijun Zhao |
| On-Site Speaker (Planned) |
Shijun Zhao |
| Abstract Scope |
We investigate the chemical composition changes around extended defects, including dislocations, stacking faults, and grain boundaries (GBs) in HEAs to explore the chemical-structure-mechanical relationship. A correlation between the degree of structural disorder and the chemical segregation/depletion phenomenon in the proximity of extended defects has been uncovered. Due to the extreme chemical complexity in HEAs, CSRO inevitably contributes to the elemental rearrangement and affects segregation. Consequently, the segregation behavior in HEAs is mainly controlled by interactions between different atomic pairs, and the segregation entropy also plays a dominant role. By decoupling the strengthening contribution from elemental segregation and CSRO, we demonstrate and highlight that the strengthening in HEAs can be modulated by elemental segregation. In addition, we demonstrate that such local ordering around GBs strongly affects defect-GB interactions in HEAs, which have significant implications for their irradiation resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, Nuclear Materials |