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 |
Grain Boundaries and Dislocations Can Amplify Local Chemical Ordering |
| Author(s) |
Timothy J. Rupert |
| On-Site Speaker (Planned) |
Timothy J. Rupert |
| Abstract Scope |
The atomic arrangements and gradients in local stress near defects can result in segregation-induced amplification of local chemical ordering. Grain boundaries in a number of complex concentrated alloys are found to localize chemical order observed in the bulk, such that planar ordered features result. This effect enables the isolation of local chemical order more readily, while also representing a defect state that is resistant to evolution from mechanisms such as irradiation-driven grain boundary migration. For dislocations, locally stressed regions modify the bulk solubility limit and lead to patterning of chemical order. Again, bulk ordering tendencies are maintained yet strongly amplified and localized. For these features, the effect on plasticity is explored by probing properties such as strength, strain hardening, and strain rate sensitivity. As a whole, this work shows that the interplay between defect structure and local chemical ordering gives materials engineers a diverse toolbox for alloy design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Characterization, High-Entropy Alloys |