| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Hydrogen Concentration Effects on Monotonic and Cyclic Plasticity of Pure Nickel |
| Author(s) |
Mohammad Imroz Alam, Leonidas Zisis, Joseph Ronevich, Michael D Sangid, Zachary D. Harris |
| On-Site Speaker (Planned) |
Mohammad Imroz Alam |
| Abstract Scope |
Hydrogen-induced premature failure of metallic components severely impacts industries such as aerospace, marine, energy, and transportation. Efforts to mitigate this issue by designing hydrogen-resistant alloys or developing hydrogen-sensitive structural integrity models are hindered by an incomplete understanding of the underlying physical processes governing hydrogen effects on plastic deformation. To address this knowledge gap, the effect of hydrogen concentration on both monotonic and cyclic plastic deformation was studied in commercially pure nickel. Monotonic tensile and fully-reversed strain amplitude-controlled fatigue experiments are performed on polycrystalline nickel with hydrogen concentrations ranging from 0 to 5000 atomic parts per million (appm). Results of these experiments are interpreted using dislocation density-based hardening models, which reveal that hydrogen promotes plastic deformation via a synergistic influence on dislocation storage and annihilation. These findings are then evaluated in the context of existing proposed mechanisms for hydrogen-induced degradation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, |