| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dilute Alloying and Impurity Effects on Phase Transformations
|
| Presentation Title |
Role of impurities and dilute alloying elements on long-range order in Ni-Cr-based alloys |
| Author(s) |
Julie D. Tucker, Jia-Hong Ke, Noah Weible, David Sprouster |
| On-Site Speaker (Planned) |
Julie D. Tucker |
| Abstract Scope |
The formation of long-range ordered phase Ni2Cr in Ni-Cr-based alloys (e.g., 690, 625) is known to cause hardening, embrittlement and lattice contraction. The timescales of this phase transformation vary widely between model and commercial alloys, likely due to the presence of minor alloys additions (e.g., Ti, Si, Al) hypothesized to bind with vacancies and slow diffusion. Conversely, impurities (e.g., P, S) are known to enhance vacancy diffusion and accelerate this phase transformation due to vacancy drag mechanism. In this work we compare first principles simulations of defect binding and migration with experimental isothermal aging and irradiations of model and commercial alloys to elucidate the effect of each element and the mechanism by which it impacts long-range order formation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Phase Transformations |