About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
Mesoscale Mechanical Behavior of Bicrystals in Hydrogen Environments: Insights from In-Situ H2-Testing |
| Author(s) |
Thomas Straub, Matthew James Connolly, Frank William DelRio |
| On-Site Speaker (Planned) |
Thomas Straub |
| Abstract Scope |
The development of materials capable of withstanding extreme operational conditions, particularly hydrogen environments, is essential for the evolving hydrogen economy. To achieve this, the authors utilize mesoscale tensile samples with micrometer dimensions (e.g., a cross section of 400 µm x 200 µm) for the mesomechanical characterization of small components and the investigation of local characteristics in larger structures (e.g. welded joints in pipelines). The authors developed a custom high-pressure hydrogen chamber designed to accommodate the testing of these mesoscale samples, enabling quasi-static, fatigue, and fracture mechanical experiments at pressures of up to 100 bar. Bicrystals, which consist of two crystals sharing a common grain boundary, provide a unique platform for examining mechanical behavior of materials at the mesoscale. This study focuses on the mechanical properties of bicrystals (FeSi) under varying hydrogen concentrations, elucidating the role of hydrogen at the grain boundary and providing the data necessary for modeling the macroscale. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, |