About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components III
|
Presentation Title |
O-11: Migration of Intergranular He Gas Bubbles under a Thermal Gradient in Fe by Phase-field Modeling |
Author(s) |
Yixi Shen, Peng Wen, An Ta, Simon Phillpot, Douglas Spearot |
On-Site Speaker (Planned) |
Yixi Shen |
Abstract Scope |
A phase-field model is employed to study thermal gradient driven kinetics of He gas bubble interactions with Fe grain boundaries. First, the contact angle of intergranular He gas bubbles with different ratios of grain boundary energy to He bubble surface energy are measured. In agreement with theory, the contact angle decreases with an increase in the energy ratio. Then, the dependence of He bubble velocity along the grain boundary on energy ratio, temperature gradient, and diffusivity of He is measured. It is found that He gas bubble migration velocity is slower in the grain boundaries than in the matrix and that the intergranular He bubble migration velocity increases as the energy ratio increases. Diffusivity of He in the grain boundary has negligible effect on the intergranular bubble migration. Finally, the trapping effect of a grain boundary on He bubbles is studied by applying temperature gradient perpendicular to the grain boundary. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Modeling and Simulation, Mechanical Properties |