About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Some Antagonist Processes of Hydrogen/Plasticity Interaction in fcc Metal Alloys: The Effect of Ni3Al Precipitate State on Nickel Base Alloys |
| Author(s) |
Siva Prasad Murugan, Nadjib Iskounen, Marie Landeiro Dos Reis, Jamaa Bouhattate, Abdelali Oudriss, Xavier Feaugas |
| On-Site Speaker (Planned) |
Xavier Feaugas |
| Abstract Scope |
Hydrogen-deformation interactions and their role in plasticity are well accepted as key features in understanding hydrogen embrittlement. To prevent this process, we have studied in nickel base alloys (Waspaloy@) the consequence of Ni3Al precipitation on hydrogen storage and the consequences on the different plasticity mechanisms. Using micro-indentation and TEM characterization three regimes of plasticity (weekly coupled shearing, strongly coupled shearing and Orowan bypassing by looping). The solubility of hydrogen and the misfit of precipitate are correlated, and their evolution coincide with the three regimes previously defined. Using loading and unloading tensile tests and nano-indentation tests, the impact of hydrogen on elementary processes of dislocation shearing and Orowan bypassing by looping is questioned in terme of short- and long-range internal stresses and elasticity properties. Antagonist softening and hardening effects of hydrogen are related and commented on the base of TEM observations and precipitate state. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Mechanical Properties, Characterization |