| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
New advances of the impact of hydrogen on the plasticity of nickel alloys based on nano-indentation investigations |
| Author(s) |
Yasmine Ben Jedidia, Siva Prasad Murugan, Abdelali Oudriss, Xavier Feaugas |
| On-Site Speaker (Planned) |
Xavier Feaugas |
| Abstract Scope |
One of the fundamental aspects of hydrogen embrittlement is based on the impacts of hydrogen on the elementary mechanisms of plasticity. Even though it is well known that the solute hydrogen generally deteriorates the ductility of nickel and nickel alloys, it highlighted the exitance of antagonistic processes in the hydrogen effect as well, i.e., hydrogen-induced hardening and/or softening without a relevant universal explanation.
In this work, the impact of hydrogen on elastic modulus, dislocation nucleation (i.e., pop-in), and hardness was investigated in nickel base alloys using nanoindentation. The evolution of the different properties during hydrogen desorption offers the opportunity to distinguish the direct impact of hydrogen from those associated with solute-induced defects. In this framework, hydrogen and vacancies contents are followed for different desorption time and correlate with mechanical properties obtained by nano-indentation. The competition between hardening and softening is questioned by TEM observation and the relationship with metallurgical features. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Environmental Effects, Copper / Nickel / Cobalt |