Microstructure changes and thermal conductivity reduction in UO2 following 3.9 MeV He2+ ion irradiation

被引：38
作者：
Pakarinen, Janne [1 ]
Khafizov, Marat [2 ]
He, Lingfeng [1 ]
Wetteland, Chris [3 ]
Gan, Jian [2 ]
Nelson, Andrew T. [4 ]
Hurley, David H. [2 ]
El-Azab, Anter [5 ]
Allen, Todd R. [1 ,2 ]
机构：
[1] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA
[2] Idaho Natl Lab, Idaho Falls, ID 83415 USA
[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[4] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
[5] Purdue Univ, Sch Nucl Engn, W Lafayette, IN 47907 USA
来源：
JOURNAL OF NUCLEAR MATERIALS | 2014年 / 454卷 / 1-3期
关键词：
URANIUM-DIOXIDE; SINGLE-CRYSTALS; SOLID-SOLUTIONS; NUCLEAR-FUELS; BURN-UP; LATTICE; CERAMICS; EVOLUTION; BEHAVIOR; DEFECTS;
D O I：
10.1016/j.jnucmat.2014.07.053
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructural changes and associated effects on thermal conductivity were examined in UO2 after irradiation using 3.9 MeV He2+ ions. Lattice expansion of UO2 was observed in X-ray diffraction after ion irradiation up to 5 x 1016 He2+/cm(2) at low-temperature (<200 degrees C). Transmission electron microscopy (TEM) showed homogenous irradiation damage across an 8 mu m thick plateau region, which consisted of small dislocation loops accompanied by dislocation segments. Dome-shaped blisters were observed at the peak damage region (depth around 8.5 mu m) in the sample subjected to 5 x 10(16) He2+/cm(2), the highest fluence reached, while similar features were not detected at 9 x 10(15) He2+/cm(2). Laser-based thermoreflectance measurements showed that the thermal conductivity for the irradiated layer decreased about 55% for the high fluence sample and 35% for the low fluence sample as compared to an un-irradiated reference sample. Detailed analysis for the thermal conductivity indicated that the conductivity reduction was caused by the irradiation induced point defects. (C) 2014 Elsevier B.V. All rights reserved.
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页码：283 / 289
页数：7
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