About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Additively Manufactured Materials for Nuclear Energy
|
| Presentation Title |
Molecular Dynamics Investigation of Helium-Induced Damage in Alloy 800H |
| Author(s) |
Thaneshwor Kaloni, Ibrahim Cheik Njifon, Edmanuel Torres |
| On-Site Speaker (Planned) |
Thaneshwor Kaloni |
| Abstract Scope |
Alloy 800H serves as a key structural material for nuclear reactors. During irradiation, it experiences microstructural degradation arising from irradiation defect accumulation and helium (He) generation, impacting long-term performance. In this work, molecular dynamics simulations were employed to explore the coupled effects of He generation and irradiation-induced defect accumulation in polycrystalline alloy 800H at 600 K. The results indicate that irradiation promotes grain growth. However, decreasing the grain size or increasing the He concentration promotes the stability of the polycrystalline structure. In addition, the increase in He content reduces the dislocation density while promoting the growth of large defect clusters. Structural analysis further revealed that He atoms preferentially aggregate within these large defect clusters, typically bounded by dislocation loops. Finally, we find these effects weaken the mechanical properties of alloy 800H. |