| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
In-situ Transmission X-ray Microscopy Imaging of Hydrogen Charged Metals and Alloys |
| Author(s) |
Wendy Gu, Andrew Lee, Jiyun Kang |
| On-Site Speaker (Planned) |
Wendy Gu |
| Abstract Scope |
Understanding hydrogen degradation of materials is critical to the green hydrogen economy. Here, synchrotron transmission X-ray microscopy (TXM) is used to image metals and alloys that simultaneously undergo electrochemical hydrogen charging and straining. The goal of this study is to provide experimental data to examine prevailing hydrogen embrittlement mechanisms. TXM is used to detect the formation of voids of ~100 nm to microns in size near the crack tip. In iron, we find that voids are elongated perpendicular to the loading direction, and highly localized at the crack tip during hydrogen charging in intergranular failure. Dynamic TXM imaging enables the observation of void-mediated crack growth, as well as the coalescence of the primary crack with secondary cracks. Cracks and additional plasticity occur at grain boundaries during transgranular failure. In-situ testing of Hastelloy reveals the influence of nano-precipitates on crack propagation and void growth in a hydrogen environment. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Sustainability |