About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Some Hardening and Softening Antagonist Processes Induced by Hydrogen on Cyclic Behavior of Nickel Singe Crystal |
Author(s) |
Guillaume Hachet, Arnaud Metsue, Abdelali Oudriss, Xavier Feaugas |
On-Site Speaker (Planned) |
Xavier Feaugas |
Abstract Scope |
In order to understand the nature of the hydrogen-induced hardening and softening process in f.c.c. metals, a substantial effort was made to determine the effect of hydrogen on the cyclic stress-strain behavior of nickel single crystals. A multi-scale approach allows to evaluate the effects of hydrogen on the mechanical response from the macroscopic scale down to the atomic scale. At the macroscopic scale, cyclic tests are conducted on nickel single crystal with several hydrogen concentrations to evaluate its consequences on the hardening curve, back and effective stresses. Then, microstructural characterization of the dislocations distributions developed is conducted for several plastic deformations on nickel with and without hydrogen. Therefore, the impact of hydrogen on the elastic properties and some dislocations configurations are investigated using atomic scale calculations and specific experiments. We illustrate the hardening and softening antagonist processes associated with hydrogen and formed vacancy by hydrogen incorporation and plastic strain. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |