About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Field-Assisted Material Processing and Solidification
|
| Presentation Title |
Atomistic Modeling of Localized Thermal and Electron-Wind Mechanisms in Electro-Nano-Pulsed Ni-20Cr Grain Boundaries |
| Author(s) |
Wenwu Xu, Runjian Jiang, Nicolas Mosqueda, Sean O'Grady, Zachary McLaughlin, Elisa Torresani, Eugene Olevsky |
| On-Site Speaker (Planned) |
Wenwu Xu |
| Abstract Scope |
Electro-nano-pulsing (ENP) can restructure grain boundaries within nanosecond current pulses, but the relative roles of localized Joule heating and electron-wind forces remain difficult to separate experimentally. Building on prior Nichrome-80 ENP experiments that produced atomistic facets, nanoscale serrations, and step-like boundary morphologies, this talk presents atomistic simulations of ENP-like activation in a simplified Ni-20Cr solid-solution system. Bicrystal models with [001]//[111], [110]//[111], and [001]//[110] orientation relationships are used to compare boundary-character effects under localized thermal pulses, localized electron-wind body forces, and coupled loading. Permanent restructuring is quantified using grain-aligned non-affine displacement, excess energy relaxation, boundary-width evolution, local disorder, bond survival, and GB-to-matrix localization ratios. The simulations test whether high-resistivity grain boundaries behave as nanoscale current-focusing regions where transient heating activates boundary shuffling, while electron wind biases sliding, defect motion, and partial-dislocation activity. This work provides atomistic insight into ENP-driven localized grain-boundary engineering without bulk microstructural change. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Copper / Nickel / Cobalt, Modeling and Simulation |