About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Tackling Metallic Structural Materials Challenges for Advanced Nuclear Reactors
|
| Presentation Title |
Emulation of Neutron Irradiation Induced Dislocation Loops, Elemental Segregation, and Precipitation Evolution at High Dose in 800H Using Dual Ion Beam |
| Author(s) |
Xingyu Liu, Xing Wang, Arthur T. Motta |
| On-Site Speaker (Planned) |
Xingyu Liu |
| Abstract Scope |
Accelerating the qualification of structural materials for advanced nuclear reactors is necessary for materials licensing at high doses. The 800H austenitic alloy spans both fast reactor and light-water reactor applications and can serve as a convenient benchmark for irradiation data. By characterizing the cavities, dislocation loops, elemental segregation, and precipitation induced by neutron irradiation, it is possible to understand the degradation of mechanical properties. Emulating the formation of these microstructural characteristics with dual ion irradiation (9MeV Fe and 3.42MeV He) makes it possible to compare the evolution of loops, elemental segregation, and precipitation at high doses (for now up to 81dpa). It was found that the faulted loop size-distribution can be emulated, and these loops can unfault to perfect loops through loop-loop interaction. However, the precipitation cannot be fully reproduced due to the much higher dissolution rate present in dual ion irradiation as compared to neutron irradiation. |