| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Dynamic Nano and Microscale Processes in Hydrogen Charged Metals and Alloys |
| Author(s) |
Wendy Gu, Andrew Lee, Adam Barsotti, Jiyun Kang |
| On-Site Speaker (Planned) |
Wendy Gu |
| Abstract Scope |
The development of hydrogen resistant alloys is critical to support the burgeoning hydrogen economy. Here, we study hydrogen embrittlement mechanisms in iron, nickel, and a nickel-based superalloy that contains nano-precipitates. In-situ synchrotron transmission X-ray microscopy (TXM) and Kelvin Probe Force Microscopy (KPFM) are used to image these materials simultaneously with electrochemical hydrogen charging and straining. Using TXM, we observe void-mediated crack growth during both transgranular and intergranular failure, and the initiation of cracks at nano-precipitates. Microcracking is observed to increase with strain rate, yet corresponds to an increase in macroscopic ductility. KPFM reveals that hydrogen is concentrated at grain boundaries at a low plastic strain, but is distributed throughout grain boundaries and grain interiors at a higher plastic strain. Hydrogen concentration is highest at intermediate grain boundary misorientation angles (~35 degree). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Sustainability, |