| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VI
|
| Presentation Title |
Impact of Hydrogen on Dislocation Nucleation and Strength in bcc Fe-Cr Alloys |
| Author(s) |
Gerhard Dehm, Jing Rao, Maria Jazmin Duarte |
| On-Site Speaker (Planned) |
Gerhard Dehm |
| Abstract Scope |
Hydrogen is one of the energy carriers of the future, but its application is still hampered by hydrogen embrittlement (HE) of metals. Discriminating the different HE effects experimentally requires to probe mechanical properties of materials under hydrogen exposure also at the microstructure length scales. This lead to in-situ electrochemical charging of samples combined with nanoindentation. In this talk, we report on a new electrochemical cell design for nanoindentation avoiding unwanted corrosive attack of the surface and recent results on bcc Fe-Cr alloys. Our nanoindentation and micro-pillar compression experiments consistently show a reduction in critical resolved shear stress for dislocation nucleation, in accordance to the defactant theory. In addition, we observe that the lower stress for dislocation nucleation leads to a higher increase in dislocation density. Differences and similarities between nanoindentation and pillar compression under hydrogen charging will be discussed. The findings for Fe-Cr will be compared to other bcc metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electrometallurgy, Mechanical Properties, |