|About this Abstract
|MS&T21: Materials Science & Technology
|Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
|Irradiation Response of FCC and BCC Compositionally Complex Alloys Using In-situ and Ex-situ Irradiations
|Adrien Couet, Calvin Parkin, Michael Moorehead, Lin Shao, Frank Garner, Lingfeng He, Pengyuan Xiu, Wei-Ying Chen, Meimei Li, Kumar Sridharan
|On-Site Speaker (Planned)
In-core structural materials for advanced reactors are expected to exhibit corrosion and radiation tolerance superior to that of currently licensed stainless steels and ferritic-martensitic steels. Specifically, sodium-cooled fast reactor cladding material will be subjected to several hundreds of displacements per atom (dpa) over the operating lifetime. Compositionally Complex Alloys (CCAs) present a novel radiation resistant matrix design parameter to potentially complement usual microstructurally-based sink strength alloy design used in optimized steels. CCAs consisting of four or more principle alloying elements in single-phase solid solution are theorized to resist radiation effects thanks to unique energy and mass transport properties. In situ transmission electron microscope and ex-situ heavy-ion irradiation experiments were performed on CrFeMnNi and NbTaTiV CCA families using multiple ion beam facilities at various dpas and temperatures. The void swelling, dislocation loop density and chemical redistribution of CCAs are discussed and compared to less compositionally complex alloys.