| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Decoupling Irradiation Effects on Unusual Deformation Mechanisms in Alloy 625 |
| Author(s) |
Caleb Clement, Janelle Wharry |
| On-Site Speaker (Planned) |
Caleb Clement |
| Abstract Scope |
The objective of this talk is to decouple the effects of different irradiation-induced defects on deformation-induced martensitic transformations in Ni-base superalloy 625 (nominally Ni-23Cr-8Mo). This decoupling study is accomplished by a series of irradiations: fast neutrons to 1 dpa at 400ºC, 2 MeV protons to 1 dpa at 500°C to create a dislocation loop-dominated microstructure, 400 keV He+ to 1015 ions/cm2 for a cavity-dominated microstructure, and a dual-beam irradiation emulating the neutron irradiation. Three principal low-zone grain orientations, namely 001, 101, 111, are identified using scanning electron microscopy with electron backscatter diffraction (SEM-EBSD). The identified grains are then nanoindented, and the deformation microstructure is examined using high-resolution transmission electron microscopy (HR-TEM). The results are discussed in the context of the contribution of each defect to the free energy of the system and driving force for transformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Nuclear Materials, Characterization |