|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Modeling Evolution of Gas Bubbles on Grain Boundaries of Nano-crystalline Materials under Irradiation
||Stanislav Golubov, Alexander Barashev, Roger Stoller
|On-Site Speaker (Planned)
Nano-crystalline materials attract attention as possible candidates for nuclear-energy applications in a hope that they will demonstrate an enhanced radiation resistance. The latter is possible because grain boundaries are effective sinks for neutron-produced lattice defects, such as vacancies and self-interstitial atoms. This results in suppressing damage accumulation in their vicinity, observed as defect-denuded zones of up to 100 nm size. Fine-grain materials are expected to benefit most, if the defect-denuded zones cover the entire volume. The beneficial effect of smaller grains may be impaired by increased surface area for accelerated nucleation and growth of gas bubbles, leading to increased chance of inter-granular fracture. In this work, the gas-bubble evolution on grain boundaries is studied using cluster-dynamics model developed for this case. The model demonstrated an excellent agreement with experimental data for materials with relatively large grains. Here we use it to predict behavior of fine-grain high-nickel stainless steels.
||Planned: A print-only volume