|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Atomistically-informed Cluster Dynamics Modeling of Defect Cluster Evolution in Irradiated Structural Materials
||Brian Wirth, Aaron Kohnert, Andrew Payant
|On-Site Speaker (Planned)
This presentation will focus on modeling defect cluster evolution in austenitic and ferritic-martensitic steels under ion or neutron irradiation conditions. The modeling is based on a reaction-diffusion rate theory based cluster dynamics model, which uses initial cascade defect production obtained from molecular dynamics simulations of displacement cascades, as well as atomistic modeling insight of defect physics. The model includes self-interstitial and vacancy-type clusters in the form of either faulted or prismatic loops of different Burgers vector orientations, as well as spherical vacancy clusters that can also include noble gas atoms. The modeling predictions of loop evolution are compared with available experimental data, and the onset for void nucleation is evaluated as a function of the helium to dpa production ratio. Comparisons with experimental data will also be discussed within the context of key uncertainties in defect physics.
||Planned: Supplemental Proceedings volume