About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Interface Structure and Properties: Impact on Microstructure Evolution
|
| Presentation Title |
Stochasticity in Nucleation-Controlled Plasticity – Insights from Modeling and Simulation |
| Author(s) |
Dan Mordehai, Rohith Polisety, Stav Nisany, Doron Chachamovitz |
| On-Site Speaker (Planned) |
Dan Mordehai |
| Abstract Scope |
At the nanoscale, mechanical properties deviate from bulk behavior due to the dominance of discrete microstructural events, often resulting in stochastic rather than deterministic responses. In this talk, I will present examples where such stochasticity reveals underlying deformation mechanisms. First, I introduce a temperature-dependent model for yield strength distribution in nucleation-controlled plasticity, validated through molecular dynamics (MD) simulations of nanoparticle compression and nanowire tension. By fitting the model, we extract activation parameters for dislocation nucleation, showing how nucleation sites vary with temperature. The model is further applied to experimental results of Au-Ag nanoparticles. Next, I present the stochastic failure strain in nanowires, using MD simulations of bi-crystalline and penta-twinned structures. We demonstrate how competing mechanisms, such as detwinning, dislocation-twin interactions, and void formation, shape the observed variability in failure strain. These findings highlight the predictive power of statistical approaches in nanoscale mechanics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, |