|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||Nanomechanical Properties of Neutron Irradiated Austenitic Steels
||Tianyi Chen, Mack Cullison
|On-Site Speaker (Planned)
Predicting and controlling the radiation-induced microstructure evolution and mechanical degradation in reactor structural materials are of primary importance for the sustainability of current nuclear power plants and the deployment of future nuclear energy forms. Advanced austenitic alloys are widely used as structural materials in LWRs and cladding materials in fast reactors. They are also candidate materials for the next-generation sodium-cooled fast reactors. Driven by the need for accelerated screening, qualification, and development of advanced nuclear materials, irradiation, post-irradiation characterization, and small-scale mechanical testing have been applied to the advanced austenitic alloys.The microstructural and chemical evolutions of different alloys after neutron radiation were characterized and compared. Radiation-induced defects and precipitates were quantified and used to rationalize the changes in nanomechanical properties. The deformation microstructure were further characterized to illustrate the roles of defects in modulating the deformation mechanisms of the alloys.