About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Fracture in Metals: Insights from Experiments and Modeling Across Length and Time Scales
|
Presentation Title |
Polycrystalline Scale Study of H-Defect Interactions to Investigate H-Enhanced Localized Plasticity |
Author(s) |
S. Mohadeseh Taheri-Mousavi |
On-Site Speaker (Planned) |
S. Mohadeseh Taheri-Mousavi |
Abstract Scope |
H-embrittlement (HE) is the most critical life limiting factor of high strength alloys. HE repartitions plasticity along crack surfaces to localized bands and leads to abrupt crack growth and significant ductility loss. Tracking H to reveal it role in these phenomena experimentally is extremely challenging or even impossible. Here, we show how by combining molecular dynamics and grand canonical Monte Carlo we could model diffusion-deformation of H at large polycrystalline scales. I will show why simulations at this scale is required to solve long standing debates about H influence on dislocation mobility and plasticity. More specifically, I will discuss about H interactions with free crack surfaces and grain boundaries and show how their dislocation interactions will be changed with the presence of H. These insights are required for the design of alloys resistant to HE. |