TEM and XAS investigation of fission gas behaviors in U-Mo alloy fuels through ion beam irradiation

JOURNAL OF NUCLEAR MATERIALS

卷:494

Article

Zang, Hang¹  Yun, Di^1,2,5  Mo, Kun²  Wang, Kunpeng⁴  Mohamed, Walid²  Kirk, Marquis A.²  Velazquez, Daniel³  Seibert, Rachel³  Logan, Kevin³  Terry, Jeffrey³  Baldo, Peter²  Yacout, Abdellatif M.²  Liu, Wenbo¹  Zhang, Bo¹  Gao, Yedong¹  Du, Yang¹  Liu, Jing¹ 

[1] Xi An Jiao Tong Univ, Dept Nucl Sci & Technol, Xian 710049, Shaanxi, Peoples R China

[2] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA

[3] IIT, Chicago, IL 60616 USA

[4] Nucl & Radiat Safety Ctr, 54 Hongliannancun,POB 8088, Beijing 100082, Peoples R China

[5] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China

关键词: Metallic alloy fuels;    U-Mo alloy;    Fission gas behaviors;    Xe bubble;    Ion irradiation;    XAS;   

DOI  :  10.1016/j.jnucmat.2017.07.033

来源: Elsevier

【 摘 要 】

In this study, smaller-grained (hundred nano-meter size grain) and larger-grained ( micro-meter size grain) U-10Mo specimens have been irradiated (implanted) with 250 keV Xe_ beam and were in situ characterized by TEM. Xe bubbles were not seen in the specimen after an implantation fluence of 2 x 10(20) ions/m(2) at room temperature. Nucleation of Xe bubbles happened during heating of the specimen to a final temperature of 300 degrees C. By comparing measured Xe bubble statistics, the nucleation and growth behaviors of Xe bubbles were investigated in smaller-grained and larger-grained U-10Mo specimens. A multi-atom kind of nucleation mechanism has been observed in both specimens. X-ray Absorption spectroscopy showed the edge position in the bubbles to be the same as that of Xe gas. The size of Xe bubbles has been shown to be bigger in larger-grained specimens than in smaller-grained specimens at the same implantation conditions. (C) 2017 Elsevier B.V. All rights reserved.

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