About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Microstructure-Sensitive Modeling Across Length Scales: An MPMD/SMD Symposium in Honor of David L. McDowell
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| Presentation Title |
Effects of Hydrogen Assisted Vacancy Production on Diffusional Creep Investigated via a Coupled Cluster Dynamics-Crystal Plasticity Framework |
| Author(s) |
Yash Pachaury, Aaron Kohnert, Laurent Capolungo |
| On-Site Speaker (Planned) |
Yash Pachaury |
| Abstract Scope |
This work investigates the role of hydrogen assisted vacancy production (HAVP) mechanism on diffusion-dominated creep deformation response of a model ferritic steel. We utilize a coupled cluster dynamics and full-field crystal plasticity (CP) formulation to investigate the dependence of the HAVP mechanism on temperature and hydrogen gas pressure and its effect on creep. Effective vacancy current into/away from the climbing dislocations is determined from the solution of reaction-drift-diffusion system of equations around an edge dislocation under the presence of hydrogen. This, in essence, gives an effective sink efficiency dependent on the climb force which is then utilized as an input into the CP framework. The CP framework accounts for diffusion, stress-assisted drift, and effective climb facilitated by excess vacancies. Through parametric studies, we also report the regimes where HAVP mechanism is expected to play a significant role on the creep deformation response of the material. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, Other |