About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
On the Orientation Dependence of Hydrogen-Prompted Dislocation Structure Evolution in Ni |
| Author(s) |
Shuai Wang |
| On-Site Speaker (Planned) |
Shuai Wang |
| Abstract Scope |
In this work, the evolution of dislocation structures in different orientated grains of the uncharged and hydrogen-charged polycrystalline Ni was systematically investigated. By using site-specific characterization methods, we discover that hydrogen-enhanced localized plasticity (HELP) is orientation-dependent, with the following sequence: [100] > [111] > [110]. The results identified different dislocation evolution in the surface and interior grains. In comparison with the interior grain, Hydrogen has less effect on the dislocation evolution in the surface grain. In the interior grains, the characteristic size of dislocation cell blocks was reduced by the presence of hydrogen. Massive incompatibility between different orientated grains, induced by the orientation dependence of HELP, contributes to the premature intergranular fracture of Ni, especially for the 400 ppm H-charged Ni. Our results suggest that optimizing orientation distribution is a potential approach for enhancing metals' resistance to hydrogen damage. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, Environmental Effects, Characterization |