In-situ TEM study of microstructural evolution in NFA and Cr3C2@SiC-NFA composite during ion irradiation
Abstract
In this article, the ion irradiation responses of a Fe-based nanostructured ferritic alloy or ‘NFA’ (Fe–9Cr–2W–0.2V–0.4Ti–0.3Y2O3) and a Cr3C2@SiC-NFA composite were assessed. In-situ ion irradiation with TEM observation was carried out by using 1 MeV Kr++ ions at doses of 0, 1, 3, 5, 10 dpa and temperatures of 300 °C and 450 °C. Both the NFA and Cr3C2@SiC-NFA samples showed significant dislocation density after 10 dpa at 300 °C. However, the Cr3C2@SiC-NFA composite showed a significantly lower dislocation loop density and a smaller average loop size during the irradiation at 450 °C as opposed to the NFA. At 300 °C, 1/2<111> type dislocation loops were observed in both the NFA and Cr3C2@SiC-NFA samples. Interestingly, at 450 °C, <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. Lastly, the additional Si element in the Cr3C2@SiC-NFA sample might have played a significant role in determining the dominant loop types.
- Authors:
-
[1];
[1];
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Argonne National Laboratory (ANL), Lemont, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1546959
- Alternate Identifier(s):
- OSTI ID: 1546115
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materialia
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: C; Journal ID: ISSN 2589-1529
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; dislocation evolution; ferritic alloys; in-situ TEM; ion irradiation; loop density
Citation Formats
Bawane, Kaustubh, Lu, Kathy, Bai, Xian-Ming, Chen, Wei-Ying, and Li, Meimei. In-situ TEM study of microstructural evolution in NFA and Cr3C2@SiC-NFA composite during ion irradiation. United States: N. p., 2019.
Web. doi:10.1016/j.mtla.2019.100412.
Bawane, Kaustubh, Lu, Kathy, Bai, Xian-Ming, Chen, Wei-Ying, & Li, Meimei. In-situ TEM study of microstructural evolution in NFA and Cr3C2@SiC-NFA composite during ion irradiation. United States. https://doi.org/10.1016/j.mtla.2019.100412
Bawane, Kaustubh, Lu, Kathy, Bai, Xian-Ming, Chen, Wei-Ying, and Li, Meimei. Fri .
"In-situ TEM study of microstructural evolution in NFA and Cr3C2@SiC-NFA composite during ion irradiation". United States. https://doi.org/10.1016/j.mtla.2019.100412. https://www.osti.gov/servlets/purl/1546959.
@article{osti_1546959,
title = {In-situ TEM study of microstructural evolution in NFA and Cr3C2@SiC-NFA composite during ion irradiation},
author = {Bawane, Kaustubh and Lu, Kathy and Bai, Xian-Ming and Chen, Wei-Ying and Li, Meimei},
abstractNote = {In this article, the ion irradiation responses of a Fe-based nanostructured ferritic alloy or ‘NFA’ (Fe–9Cr–2W–0.2V–0.4Ti–0.3Y2O3) and a Cr3C2@SiC-NFA composite were assessed. In-situ ion irradiation with TEM observation was carried out by using 1 MeV Kr++ ions at doses of 0, 1, 3, 5, 10 dpa and temperatures of 300 °C and 450 °C. Both the NFA and Cr3C2@SiC-NFA samples showed significant dislocation density after 10 dpa at 300 °C. However, the Cr3C2@SiC-NFA composite showed a significantly lower dislocation loop density and a smaller average loop size during the irradiation at 450 °C as opposed to the NFA. At 300 °C, 1/2<111> type dislocation loops were observed in both the NFA and Cr3C2@SiC-NFA samples. Interestingly, at 450 °C, <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. Lastly, the additional Si element in the Cr3C2@SiC-NFA sample might have played a significant role in determining the dominant loop types.},
doi = {10.1016/j.mtla.2019.100412},
journal = {Materialia},
number = C,
volume = 7,
place = {United States},
year = {Fri Jul 26 00:00:00 EDT 2019},
month = {Fri Jul 26 00:00:00 EDT 2019}
}
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Fig. 1: Kinematic bright field (top) and weak beam dark field (bottom) TEM images of the NFA sample (zone axis=[001]) after the in-situ Kr ++ ion irradiation at 300 ° C: (a) 0 dpa, (b) 3 dpa, (c) 5 dpa, and (d) 10 dpa.