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Title: Interface reactions and mechanical properties of FeCrAl-coated Zircaloy-4

Abstract

FeCrAl has been proposed as a coating layer to enhance accident tolerance of Zircaloy-4 fuel cladding. In this study, we systematically examined the diffusion kinetics and interface compound formation of the spray-coated FeCrAl and Zircaloy-4 substrate. After vacuum annealing at 923 K, 963 K, and 998 K for various time periods, a mixed Zr 2Fe phase and Zr 3Fe formed at the interface. The formation energies of these two phases were found to be 65 kJ/mol and 58 kJ/mol for Zr 2Fe and Zr 3Fe, respectively. Bending tests of cantilevers prepared by a focused ion beam technique showed good interface bonding between the coating layer and the substrate. Nanoindentation and micropillar compression tests in the cross-section of polished samples show different mechanical responses of each phase. The substrate exhibited the lowest hardness and most ductile deformation under compression, while interfacial Zr 2Fe and Zr 3Fe possessed the highest hardness and brittle deformation.

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [3];  [3];  [3];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Texas A & M Univ., College Station, TX (United States)
  3. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1501812
Report Number(s):
LA-UR-18-28588
Journal ID: ISSN 0022-3115
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Name: Journal of Nuclear Materials; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Gigax, Jonathan Gregory, Kennas, Miltiadas, Kim, Hyosim, Maier, Benjamin R., Yeom, Hwasung, Johnson, Greg O., Sridharan, Kumar, and Shao, Lin. Interface reactions and mechanical properties of FeCrAl-coated Zircaloy-4. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.03.004.
Gigax, Jonathan Gregory, Kennas, Miltiadas, Kim, Hyosim, Maier, Benjamin R., Yeom, Hwasung, Johnson, Greg O., Sridharan, Kumar, & Shao, Lin. Interface reactions and mechanical properties of FeCrAl-coated Zircaloy-4. United States. doi:10.1016/j.jnucmat.2019.03.004.
Gigax, Jonathan Gregory, Kennas, Miltiadas, Kim, Hyosim, Maier, Benjamin R., Yeom, Hwasung, Johnson, Greg O., Sridharan, Kumar, and Shao, Lin. Thu . "Interface reactions and mechanical properties of FeCrAl-coated Zircaloy-4". United States. doi:10.1016/j.jnucmat.2019.03.004.
@article{osti_1501812,
title = {Interface reactions and mechanical properties of FeCrAl-coated Zircaloy-4},
author = {Gigax, Jonathan Gregory and Kennas, Miltiadas and Kim, Hyosim and Maier, Benjamin R. and Yeom, Hwasung and Johnson, Greg O. and Sridharan, Kumar and Shao, Lin},
abstractNote = {FeCrAl has been proposed as a coating layer to enhance accident tolerance of Zircaloy-4 fuel cladding. In this study, we systematically examined the diffusion kinetics and interface compound formation of the spray-coated FeCrAl and Zircaloy-4 substrate. After vacuum annealing at 923 K, 963 K, and 998 K for various time periods, a mixed Zr2Fe phase and Zr3Fe formed at the interface. The formation energies of these two phases were found to be 65 kJ/mol and 58 kJ/mol for Zr2Fe and Zr3Fe, respectively. Bending tests of cantilevers prepared by a focused ion beam technique showed good interface bonding between the coating layer and the substrate. Nanoindentation and micropillar compression tests in the cross-section of polished samples show different mechanical responses of each phase. The substrate exhibited the lowest hardness and most ductile deformation under compression, while interfacial Zr2Fe and Zr3Fe possessed the highest hardness and brittle deformation.},
doi = {10.1016/j.jnucmat.2019.03.004},
journal = {Journal of Nuclear Materials},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {3}
}

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This content will become publicly available on March 7, 2020
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