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Title: Epitaxial Fe/Y2O3 interfaces as a model system for oxide-dispersion-strengthened ferritic alloys

Abstract

The fundamental mechanisms underlying the superior radiation tolerance properties of oxide-dispersion-strengthened ferritic steels and nanostructured ferritic alloys are poorly understood. Thin film heterostructures of Fe/Y2O3 can serve as a model system for fundamental studies of radiation damage. Epitaxial thin films of Y2O3 were deposited by pulsed laser deposition on 8% Y:ZrO2 (YSZ) substrates with (100), (110), and (111) orientation. Metallic Fe was subsequently deposited by molecular beam epitaxy. Characterization by x-ray diffraction and Rutherford backscattering spectrometry in the channeling geometry revealed a degree of epitaxial or axiotaxial ntation for Fe(211) deposited on Y2O3(110)/YSZ(110). In contrast, Fe on Y2O3(111)/YSZ(111) was fully polycrystalline, and Fe on Y2O3(100)/YSZ(100) exhibited out-of-plane texture in the [110] direction with little or no preferential in-plane orientation. Scanning transmission electron microscopy imaging of Fe(211)/Y2O3(110)/YSZ(110) revealed a strongly islanded morphology for the Fe film, with no epitaxial grains visible in the cross-sectional sample. Well-ordered Fe grains with no orientation to the underlying Y2O3 were observed. Well-ordered crystallites of Fe with both epitaxial and non-epitaxial orientations on Y2O3 are a promising model system for fundamental studies of radiation damage phenomena. This is illustrated with preliminary results of He bubble formation following implantation with a helium ion microscope. He bubble formationmore » is shown to preferentially occur at the Fe/Y2O3 interface.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1188881
Report Number(s):
PNNL-SA-105513
46001; KC0201020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials, 457:352-361
Additional Journal Information:
Journal Name: Journal of Nuclear Materials, 457:352-361
Country of Publication:
United States
Language:
English
Subject:
H32154; Environmental Molecular Sciences Laboratory

Citation Formats

Kaspar, Tiffany C., Bowden, Mark E., Wang, Chong M., Shutthanandan, V., Overman, Nicole R., Van Ginhoven, Renee M., Wirth, Brian D., and Kurtz, Richard J. Epitaxial Fe/Y2O3 interfaces as a model system for oxide-dispersion-strengthened ferritic alloys. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2014.11.046.
Kaspar, Tiffany C., Bowden, Mark E., Wang, Chong M., Shutthanandan, V., Overman, Nicole R., Van Ginhoven, Renee M., Wirth, Brian D., & Kurtz, Richard J. Epitaxial Fe/Y2O3 interfaces as a model system for oxide-dispersion-strengthened ferritic alloys. United States. https://doi.org/10.1016/j.jnucmat.2014.11.046
Kaspar, Tiffany C., Bowden, Mark E., Wang, Chong M., Shutthanandan, V., Overman, Nicole R., Van Ginhoven, Renee M., Wirth, Brian D., and Kurtz, Richard J. 2015. "Epitaxial Fe/Y2O3 interfaces as a model system for oxide-dispersion-strengthened ferritic alloys". United States. https://doi.org/10.1016/j.jnucmat.2014.11.046.
@article{osti_1188881,
title = {Epitaxial Fe/Y2O3 interfaces as a model system for oxide-dispersion-strengthened ferritic alloys},
author = {Kaspar, Tiffany C. and Bowden, Mark E. and Wang, Chong M. and Shutthanandan, V. and Overman, Nicole R. and Van Ginhoven, Renee M. and Wirth, Brian D. and Kurtz, Richard J.},
abstractNote = {The fundamental mechanisms underlying the superior radiation tolerance properties of oxide-dispersion-strengthened ferritic steels and nanostructured ferritic alloys are poorly understood. Thin film heterostructures of Fe/Y2O3 can serve as a model system for fundamental studies of radiation damage. Epitaxial thin films of Y2O3 were deposited by pulsed laser deposition on 8% Y:ZrO2 (YSZ) substrates with (100), (110), and (111) orientation. Metallic Fe was subsequently deposited by molecular beam epitaxy. Characterization by x-ray diffraction and Rutherford backscattering spectrometry in the channeling geometry revealed a degree of epitaxial or axiotaxial ntation for Fe(211) deposited on Y2O3(110)/YSZ(110). In contrast, Fe on Y2O3(111)/YSZ(111) was fully polycrystalline, and Fe on Y2O3(100)/YSZ(100) exhibited out-of-plane texture in the [110] direction with little or no preferential in-plane orientation. Scanning transmission electron microscopy imaging of Fe(211)/Y2O3(110)/YSZ(110) revealed a strongly islanded morphology for the Fe film, with no epitaxial grains visible in the cross-sectional sample. Well-ordered Fe grains with no orientation to the underlying Y2O3 were observed. Well-ordered crystallites of Fe with both epitaxial and non-epitaxial orientations on Y2O3 are a promising model system for fundamental studies of radiation damage phenomena. This is illustrated with preliminary results of He bubble formation following implantation with a helium ion microscope. He bubble formation is shown to preferentially occur at the Fe/Y2O3 interface.},
doi = {10.1016/j.jnucmat.2014.11.046},
url = {https://www.osti.gov/biblio/1188881}, journal = {Journal of Nuclear Materials, 457:352-361},
number = ,
volume = ,
place = {United States},
year = {Sun Feb 01 00:00:00 EST 2015},
month = {Sun Feb 01 00:00:00 EST 2015}
}