|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||Size-dependent Radiation Damage Mechanisms in Nanowires and Nanoporous Structures
||Daniel Vizoso, Maria Kosmidou, T. John Balk, Khalid Hattar, Chaitanya Deo, Remi Dingreville
|On-Site Speaker (Planned)
This presentation details the origins and size effects of the radiation-damage mechanisms in nanowires and nanoporous structures in model FCC (gold) and BCC (niobium) nanostructures using accelerated multi-cascade atomistic simulations and in-situ ion irradiation transmission electron microscopy experiments. We will discuss three different size-dependent mechanisms of damage accumulation in irradiated nanostructures: the sputtering of very small nanowires, the formation and accumulation of point defects/dislocation loops in larger nanowires, and a FCC to HCP phase transformation for a narrow range of wire diameters in the case of gold nanowires. The details of size-effects in nanowires at the transition from defect accumulation to a saturation and annihilation mechanism and how it impacts nanoporous structures will be highlighted. Taken together, our results shed light on the compounded, size-dependent mechanisms leading to the radiation resistance of nanowires and nanoporous structures. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
||Computational Materials Science & Engineering, Modeling and Simulation, Phase Transformations