| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
Radiation Induced Segregation in Nanocrystalline Alloys: Perspectives from Modeling |
| Author(s) |
Yongfeng Zhang, Raphaelle David , Aashique Rezwan , Andrew Hoffman , Haiming Wen |
| On-Site Speaker (Planned) |
Yongfeng Zhang |
| Abstract Scope |
Radiation induced segregation (RIS) refers to elemental enrichment or depletion at defect sinks that is caused by sustained defect flux and coupled defect and elemental diffusion, and it can cause severe degradation in material properties. Following the thermodynamics of irreversible processes formulation, this talk focuses on RIS in nanocrystalline alloys when sink-absorption dominates defect annihilation, to highlight the effects of i) dimensionality of the theoretical model, ii) concurrent grain growth and grain size distribution, and iii) binding of alloying elements to interstitials. In this regime, the conventional 1D bi-crystal model can overestimate RIS compared to realistic 3D models. There is a net elemental flux from larger to smaller grains when concurrent grain growth occurs, and from smaller to larger otherwise. Further, when there is preferential binding of alloying element to interstitials, novel RIS may occur, for instance, Cr enrichment at grain boundaries instead of commonly observed depletion in austenitic steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Iron and Steel |