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Title: Phase decomposition and bubble evolution in Xe implanted U 3Si 2 at 450°C

Abstract

We report on the microstructure investigations of a U 3Si 2 specimen implanted by 84 MeV Xe ions at 450°C. In the region that corresponds to the highest irradiation dose, U 3Si 2 was found to decompose into a Si-enriched nanocrystalline USi matrix phase and a U-enriched amorphous inclusion phase. Density functional theory (DFT) calculations were used to help understand the decomposition mechanism. Xe bubbles of different morphologies were observed in USi nano-grains, on USi grain boundaries, and phase boundaries. Original U 3Si 2 micro-grains were preserved on both sides of the irradiation damage peak region within the sample, implying a radiation dose threshold for decomposition of approximately 150 dpa at 450°C. In the preserved U 3Si 2 region beneath the irradiation damage peak, where critical amount of Xe ions were deposited, a monomodal size distribution of intragranular Xe bubbles with an average size of 2.68 nm formed. In both decomposed and preserved U 3Si 2, the size of Xe bubbles was found to be lower than 50 nm. Based on this observation, the fission gas behavior of U 3Si 2 is controllable and free of run-away swelling despite the occurrence of decomposition at this irradiation temperature. (C) 2019 Elseviermore » B.V. All rights reserved.« less

Authors:
 [1]; ORCiD logo [2];  [1];  [1];  [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1530396
Grant/Contract Number:  
AC02-06CH11357; AC07-051D14517; FOA-0001063
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 518; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 36 MATERIALS SCIENCE; U3Si2; accident tolerant fuel; fission gas behavior; ion irradiation; light water reactor (LWR); microstructure characterization

Citation Formats

Miao, Yinbin, Harp, Jason, Mo, Kun, Mei, Zhi-Gang, Xu, Ruqing, Zhu, Shaofei, and Yacout, Abdellatif M. Phase decomposition and bubble evolution in Xe implanted U3Si2 at 450°C. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.02.004.
Miao, Yinbin, Harp, Jason, Mo, Kun, Mei, Zhi-Gang, Xu, Ruqing, Zhu, Shaofei, & Yacout, Abdellatif M. Phase decomposition and bubble evolution in Xe implanted U3Si2 at 450°C. United States. doi:10.1016/j.jnucmat.2019.02.004.
Miao, Yinbin, Harp, Jason, Mo, Kun, Mei, Zhi-Gang, Xu, Ruqing, Zhu, Shaofei, and Yacout, Abdellatif M. Thu . "Phase decomposition and bubble evolution in Xe implanted U3Si2 at 450°C". United States. doi:10.1016/j.jnucmat.2019.02.004.
@article{osti_1530396,
title = {Phase decomposition and bubble evolution in Xe implanted U3Si2 at 450°C},
author = {Miao, Yinbin and Harp, Jason and Mo, Kun and Mei, Zhi-Gang and Xu, Ruqing and Zhu, Shaofei and Yacout, Abdellatif M.},
abstractNote = {We report on the microstructure investigations of a U3Si2 specimen implanted by 84 MeV Xe ions at 450°C. In the region that corresponds to the highest irradiation dose, U3Si2 was found to decompose into a Si-enriched nanocrystalline USi matrix phase and a U-enriched amorphous inclusion phase. Density functional theory (DFT) calculations were used to help understand the decomposition mechanism. Xe bubbles of different morphologies were observed in USi nano-grains, on USi grain boundaries, and phase boundaries. Original U3Si2 micro-grains were preserved on both sides of the irradiation damage peak region within the sample, implying a radiation dose threshold for decomposition of approximately 150 dpa at 450°C. In the preserved U3Si2 region beneath the irradiation damage peak, where critical amount of Xe ions were deposited, a monomodal size distribution of intragranular Xe bubbles with an average size of 2.68 nm formed. In both decomposed and preserved U3Si2, the size of Xe bubbles was found to be lower than 50 nm. Based on this observation, the fission gas behavior of U3Si2 is controllable and free of run-away swelling despite the occurrence of decomposition at this irradiation temperature. (C) 2019 Elsevier B.V. All rights reserved.},
doi = {10.1016/j.jnucmat.2019.02.004},
journal = {Journal of Nuclear Materials},
number = C,
volume = 518,
place = {United States},
year = {2019},
month = {2}
}

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