| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components IV
|
| Presentation Title |
Deformation Behaviour of Self-Irradiated Model Fe-9Cr and Fe-9Cr-NiSiP Alloys at Room Temperature and 300˚C: A Nanoindentation Case Study |
| Author(s) |
Katarzyna Mulewska, Damian Kalita, Magdalena Wilczopolska, Witold Chrominski, Łukasz Kurpaska |
| On-Site Speaker (Planned) |
Katarzyna Mulewska |
| Abstract Scope |
Samples were irradiated with 10MeV energy with Fe ions at room temperature up to 5 dpa and at 300˚C up to 1 and 5 dpa. We investigated the mechanical properties of pristine and ion-modified specimens using nanoindentation with Berkovich and spherical indenter tips. The Berkovich indenter probes a smaller volume, causing plastic deformation only after reaching the stress threshold and nucleating new dislocations. Spherical indenters engage pre-existing dislocations, initiating plastic deformation through their movement, especially in larger volumes. These mechanisms can be distinguished using indenter tips with varying radii. We observed a sudden displacement burst during loading, linked to increased shear stress. Our results show that shear stress reaches a critical value, activating dislocation slip by mobilizing pre-existing dislocations, nucleating new ones, or interacting with interstitial atoms or Cr, Ni, Si, P segregation. SEM, EBSD, and TEM provide further structural insights. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Iron and Steel, Characterization |