About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
Role of He Bubbles on Deformation Microstructure in Irradiated Alloy 625 |
| Author(s) |
Arya Chatterjee, Caleb Clement, Yongwen Sun, Yang Yang, Jim Ciston, Colin Ophus, Janelle P. Wharry |
| On-Site Speaker (Planned) |
Arya Chatterjee |
| Abstract Scope |
The objective of this work is to assess the effect of helium (He) ion irradiation on the formation of deformation microstructures in Ni-based Alloy 625. Under high strain nanoindentation, Alloy 625 exhibits formation of deformation twins, stacking faults, and ε-martensite. But when Alloy 625 is subjected to He irradiation, such as the alloy would experience in an advanced fission or fusion reactor, He bubbles form as the primary irradiation-induced defect microstructure. Under subsequent nanoindentation strain, these He bubbles appear to suppress the formation of twins, stacking faults, and ε-martensites. Rather, deformation in He irradiated Alloy 625 is dominated by dislocation plasticity. This suppression of localized deformation is associated with He bubble-induced strains in the microstructure, as revealed through four-dimensional scanning transmission electron microscopy (4D-STEM). These findings suggest the compressive strain that bubbles induce in the surrounding matrix competes directly with the tensile strains necessary to induce twinning and transformations. |
| Proceedings Inclusion? |
Undecided |