| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Multiscale Study of the Impact of Hydrogen-grain Boundaries Interaction on Plasticity Mechanisms in Pure Nickel |
| Author(s) |
Yasmine Ben Jedidia, Xavier Feaugas, Abdelali Oudriss |
| On-Site Speaker (Planned) |
Yasmine Ben Jedidia |
| Abstract Scope |
The effect of hydrogen on the interaction between plasticity and grain boundary character was investigated in pure nickel using tensile tests and nanoindentation. Tensile tests were performed on polycrystalline hydrogen-charged nickel samples with different grain sizes, revealing an antagonist hardening/softening effect of hydrogen. We assume that there are two different mechanisms conducting to this different failure mode, which may be linked to the distribution and character of grain boundaries and their impact on hydrogen diffusion and trapping in nickel. For further investigation, nanoindentation tests were carried out on single-crystals, bi-crystals, and polycrystals pure nickel in order to understand the interaction between hydrogen and grain boundary, and to dissociate from the influence of grain orientation. The hydrogen effect on the reduced modulus, pop-in load, and hardness, at different grain orientations and near grain boundaries obtained from nanoindentation tests, will be discussed with the support of TEM observation on indentations cross-section. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, Mechanical Properties, |