| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Components
|
| Presentation Title |
A Novel Displacement Cascade Driven Irradiation Creep Mechanism in Pure Copper |
| Author(s) |
Nargisse Khiara, Fabien Onimus, Laurent Dupuy, Jean-Paul Crocombette, Stéphanie Jublot-Leclerc, Thomas Jourdan, Thomas Pardoen, Jean-Pierre Raskin, Yves Bréchet |
| On-Site Speaker (Planned) |
Nargisse Khiara |
| Abstract Scope |
Metals and alloys used as structural materials in the nuclear core of pressurized water reactors undergo irradiation creep deformation. The mechanical behavior is well characterized at the macroscopic level. Yet, the underlying microscopic mechanisms are still unclear. In situ straining experiments under ion irradiation were conducted on pure copper. We observed that, at high stress levels, dislocations pinned on irradiation induced point defects clusters start to glide once under irradiation. The usual irradiation creep climb induced glide mechanisms were not sufficient to explain the experimental observations. Another mechanism was proposed suggesting that the dislocation glide assisted by irradiation is due to a direct interaction between the displacement cascade and the pinned dislocation. A molecular dynamics study was conducted to test this hypothesis showing that the unpinning induced by a displacement cascade of a dislocation pinned on a loop can be observed under certain conditions of stress, cascade energy and position. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Computational Materials Science & Engineering |