NSUF 25-5165: Interplay of Nanoscale Heterogeneities and Radiation Damage in Compositionally Complex Alloys

Non-dilute multicomponent alloys, or compositionally complex alloys (CCAs), is a promising materials class for components in fusion reactors as well as next-generation fission reactors. In some CCAs, nanoscale domains of local chemical order (LCO) have been observed despite microscale single-phase homogeneity. Because LCO can alter point defect diffusion barriers, they may also provide sites for accommodation of defects under irradiation. In this proposal, we seek to investigate the effect of LCO domains on defect mobility and accommodation as well as the effect of irradiation damage on the stability of these domains for three alloy classes in varied ion species environments. Ion species variation will target selective vacancy immobilization, changing the migratory point defect landscape of the alloy. This project leverages the unique capabilities of the University of Michigan Ion Beam Laboratory to detect real-time chemical information during in situ irradiation experimentation. This approach will provide novel insights into the role of LCO of varied domain constituency in CCAs, aimed towards tuning chemically ordered features that contribute to residual radiation damage reduction.

Additional Info

Field	Value
Award Announced Date	2025-07-30T09:13:47.763
Awarded Institution	Johns Hopkins University
Facility Tech Lead	Kevin Field
Irradiation Facility	Michigan Ion Beam Laboratory
PI	Mitra Taheri
PI Email	[email protected]
Project Type	RTE
RTE Number	None