About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
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| Presentation Title |
In Situ Investigation of Ion Species-Dependent Irradiation Effects on Lattice Stability in RHEAs |
| Author(s) |
Emily H. Mang, Annie Barnett, Wei-Ying Chen, Dzmitry Habaruk, Pete Baldo, Jaime Marian, Michael Falk, Mitra Taheri |
| On-Site Speaker (Planned) |
Emily H. Mang |
| Abstract Scope |
Refractory high-entropy alloys (RHEAs) are emerging as promising materials for advanced nuclear energy systems due to their thermal stability and potential radiation resistance. However, the phase stability of these multi-component systems under irradiation and high-temperature conditions remains a critical concern. MoNbTaW is generally considered to be structurally stable in its BCC solid solution form, with limited experimental evidence of local chemical ordering. This study investigates the microstructural evolution of the MoNbTaW RHEA under in situ ion irradiation, with and without simultaneous helium implantation. Our findings reveal that helium introduction not only alters the defect microstructure but also promotes the formation of intergranular substructures that interact with mobile dislocations. These observations highlight the complex interplay between irradiation-induced defect dynamics and interphase boundary behavior in RHEAs, emphasizing the need for a deeper understanding of dynamic phase transformation mechanisms under extreme conditions in complex alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Nuclear Materials, Characterization |