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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Powder Materials for Energy Applications
Presentation Title Microstructural Evolution of NFA and Cr3C2@SiC-NFA Composite during Ion Irradiation
Author(s) Kathy Lu, Kaustubh Bawane, David Bai, Meimei Li
On-Site Speaker (Planned) Kathy Lu
Abstract Scope Ion irradiation responses of a Fe-based nanostructured ferritic alloy or ‘NFA’ (Fe-9Cr-2W-0.2V-0.4Ti-0.3Y3C2) and a Cr3C2@SiC-NFA composite were assessed. In-situ ion irradiation with TEM observation was carried out using 1 MeV Kr++ ions at doses of 0, 1, 3, 5, and 10 dpa and temperatures of 300C and 450C. Both the NFA and Cr3C2@SiC-NFA samples showed significant dislocation density after 10 dpa at 300C. However, the Cr3C2@SiC-NFA composite showed a lower dislocation loop density and a smaller average loop size during the irradiation at 450C as opposed to the NFA. Interestingly, at 450C, <100> type loops were dominant in the NFA sample while 1/2<111> type loops were still dominant in the Cr3C2@SiC-NFA sample. The results were discussed based on the large surface sink effects and enhanced interstitial-vacancy recombination at higher temperatures. The additional Si element in the Cr3C2@SiC-NFA sample might have played a significant role in determining the dominant loop types.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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