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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Powder Materials for Energy Applications
Presentation Title Microstructural Evolution of a Nanostructured Ferritic Alloy Composite during In-situ Ion Irradiation
Author(s) Kathy Lu, Kaustubh Bawane, David Bai, Jing Hu, Meimei Li
On-Site Speaker (Planned) Kathy Lu
Abstract Scope Silicon carbide and carbon coated nanostructured ferritic alloy (SiC-C@NFA) composites are promising cladding materials for next-generation reactors. In this study, this material system was irradiated with Kr++ ions at 1 MeV energy up to 10 dpa at 300C and 450C. Microstructures and defect evolution were studied in-situ using the IVEM facility at Argonne National Laboratory. The effect of ion irradiation on various phases such as α-ferrite (NFA) matrix, (Fe,Cr)7C3, and (Ti,W)C precipitates were evaluated. The α-ferrite matrix showed a continuous increase in dislocation density along with spatial ordering (or loop string) of dislocations at >5 dpa irradiation. The size of the dislocation loops at 450C was higher than that at 300C. The nucleation and growth of new (Ti,W)C precipitate in α-ferrite grains increase with the ion dose at 450C. This study provides an in-depth understanding of the ion irradiation resistance of the SiC-C@NFA system.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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