NSUF 24-4856: Development of an Experimental-Simulation Benchmarking Database for Irradiation-Enhanced Long Range Ordering in Ni-Cr-Mo alloys

Advanced nuclear reactor concepts require materials that can withstand corrosive media, high temperature, and high dose. Ni- and Ni-Cr-Mo-based structural alloys are under consideration for these applications by long-range ordered (LRO) phase formation, which is accelerated under irradiation, can negatively impact their mechanical performance. This work proposes to use in-situ TEM ion irradiations couple with post-irradiation 4D scanning transmission electron microscopy (4D-STEM) followed by post-exposure annealing experiments to understand the influence of localized strain and point defect-defect clusters on the formation and dissolution kinetics of LRO phase formation. Irradiated LRO phase formation will be matched by corresponding long-term (>1000 hrs) thermal annealing experiments where both sample sets will be in-situ TEM annealed to evaluate the role of a pre-existing point defect concentration on the dissolution kinetics of LRO. This work will be performed on a model and commercial alloy to enable scalability from fundamentals to engineering grade applications. The work will be performed at the Michigan Ion Beam Laboratory and the Michigan Center for Materials Characterization over a six-month period from award. The expected scientific outcome is the direct observation of the on-set formation dose of LRO and on-set dissolution temperature of LRO in the selected alloys. Additional insights on the role of LRO and localized strain will be developed from the 4D-STEM imaging.

추가 정보

필드	값
Award Announced Date	2024-02-02T12:17:32.507
Awarded Institution	Idaho National Laboratory
Facility Tech Lead	Kevin Field
Irradiation Facility	Michigan Ion Beam Laboratory
PI	Fei Teng
PI Email	[email protected]
Project Type	RTE
RTE Number	None