Improved irradiation resistance of accident-tolerant high-strength FeCrAl alloys with heterogeneous structures
Abstract
In this work, post–neutron irradiation examination is performed on advanced accident-tolerant fuel (ATF) cladding iron-chromium-aluminum (FeCrAl) alloys with ~10–13at. % Cr, ~10–12 at. % Al, ~1 at. % Mo, and minor alloying elements including Y irradiated to a damage level of 7 displacements per atom (dpa) at irradiation temperatures of 267–282 °C. A compositional dependency of the Cr and Al content is observed on the ratio of sessile and glissile dislocation loops, where the density of a$$\langle$$100$$\rangle$$ type loops is somewhat higher than the a/2$$\langle$$111$$\rangle$$ type loops. The α' precipitate number density is inversely correlated to the starting Cr concentration of the alloys of interest. The irradiation to a higher dose of 7 dpa results in a higher density of dislocation loops and α' precipitates for the same alloys at a lower irradiation dose, such as 1.8 dpa. In this work, the effect of α' precipitates on the dislocation loop density is discussed, and the presence of α' appears to inhibit the nucleation of loops. Compared with first-generation FeCrAl alloys, these advanced alloys with heterogeneous structure exhibit a lower Cr concentration in α' precipitation at the same dose level; they act as weaker obstacles deviating from the primary hardening contribution from the mature α'. Hence, the overall irradiation-induced hardening decreases; our alloys show improved radiation resistance because of their stronger sink strengths. The results presented in this paper could provide insights for the design and optimization of ATF cladding materials for future fission and space applications.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Oregon State Univ., Corvallis, OR (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain. Advanced Fuel Campaign; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1886513
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 231; Journal Issue: June; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Dislocation loops; Irradiation; Precipitation; Ferritic steels; Accident tolerant
Citation Formats
Mao, Keyou S., Massey, Caleb P., Yamamoto, Yukinori, Unocic, Kinga A., Gussev, Maxim N., Zhang, Dalong, Briggs, Samuel A., Karakoc, Omer, Nelson, Andrew T., Field, Kevin G., and Edmondson, Philip D. Improved irradiation resistance of accident-tolerant high-strength FeCrAl alloys with heterogeneous structures. United States: N. p., 2022.
Web. doi:10.1016/j.actamat.2022.117843.
Mao, Keyou S., Massey, Caleb P., Yamamoto, Yukinori, Unocic, Kinga A., Gussev, Maxim N., Zhang, Dalong, Briggs, Samuel A., Karakoc, Omer, Nelson, Andrew T., Field, Kevin G., & Edmondson, Philip D. Improved irradiation resistance of accident-tolerant high-strength FeCrAl alloys with heterogeneous structures. United States. https://doi.org/10.1016/j.actamat.2022.117843
Mao, Keyou S., Massey, Caleb P., Yamamoto, Yukinori, Unocic, Kinga A., Gussev, Maxim N., Zhang, Dalong, Briggs, Samuel A., Karakoc, Omer, Nelson, Andrew T., Field, Kevin G., and Edmondson, Philip D. Sat .
"Improved irradiation resistance of accident-tolerant high-strength FeCrAl alloys with heterogeneous structures". United States. https://doi.org/10.1016/j.actamat.2022.117843. https://www.osti.gov/servlets/purl/1886513.
@article{osti_1886513,
title = {Improved irradiation resistance of accident-tolerant high-strength FeCrAl alloys with heterogeneous structures},
author = {Mao, Keyou S. and Massey, Caleb P. and Yamamoto, Yukinori and Unocic, Kinga A. and Gussev, Maxim N. and Zhang, Dalong and Briggs, Samuel A. and Karakoc, Omer and Nelson, Andrew T. and Field, Kevin G. and Edmondson, Philip D.},
abstractNote = {In this work, post–neutron irradiation examination is performed on advanced accident-tolerant fuel (ATF) cladding iron-chromium-aluminum (FeCrAl) alloys with ~10–13at. % Cr, ~10–12 at. % Al, ~1 at. % Mo, and minor alloying elements including Y irradiated to a damage level of 7 displacements per atom (dpa) at irradiation temperatures of 267–282 °C. A compositional dependency of the Cr and Al content is observed on the ratio of sessile and glissile dislocation loops, where the density of a$\langle$100$\rangle$ type loops is somewhat higher than the a/2$\langle$111$\rangle$ type loops. The α' precipitate number density is inversely correlated to the starting Cr concentration of the alloys of interest. The irradiation to a higher dose of 7 dpa results in a higher density of dislocation loops and α' precipitates for the same alloys at a lower irradiation dose, such as 1.8 dpa. In this work, the effect of α' precipitates on the dislocation loop density is discussed, and the presence of α' appears to inhibit the nucleation of loops. Compared with first-generation FeCrAl alloys, these advanced alloys with heterogeneous structure exhibit a lower Cr concentration in α' precipitation at the same dose level; they act as weaker obstacles deviating from the primary hardening contribution from the mature α'. Hence, the overall irradiation-induced hardening decreases; our alloys show improved radiation resistance because of their stronger sink strengths. The results presented in this paper could provide insights for the design and optimization of ATF cladding materials for future fission and space applications.},
doi = {10.1016/j.actamat.2022.117843},
journal = {Acta Materialia},
number = June,
volume = 231,
place = {United States},
year = {Sat Mar 19 00:00:00 EDT 2022},
month = {Sat Mar 19 00:00:00 EDT 2022}
}
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