首页|Effect of grain size on gas bubble evolution in nuclear fuel:Phase-field investigations

Effect of grain size on gas bubble evolution in nuclear fuel:Phase-field investigations

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Numerous irradiation-induced gas bubbles are created in the nuclear fuel during irradiation,leading to the change of microstructure and the degradation of mechanical and thermal properties.The grain size of fuel is one of the important factors affecting bubble evolution.In current study,we first predict the thermodynamic behaviors of point defects as well as the interplay between vacancy and gas atom in both UO2 and U3Si2 according to ab initio approach.Then,we establish the irradiation-induced bubble phase-field model to investigate the formation and evolution of intra-and inter-granular gas bubbles.The effects of fission rate and temperature on the evolutions of bubble morphologies in UO2 and U3Si2 have been revealed.Especially,a comparison of porosities under different grain sizes is examined and analyzed.To understand the thermal conductivity as functions of grain size and porosity,the heat transfer capability of U3Si2 is evaluated.

grain sizepoint defectsfission gas bubble

孙丹、杨青峰、赵家珺、高士鑫、辛勇、周毅、尹春雨、陈平、赵纪军、王园园

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Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China

Key Laboratory of Materials Modification by Laser,Ion,and Electron Beams,Dalian University of Technology,Dalian 116024,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational MCF Energy Research and Development Program of China

U216721712205286119050252018YFE0308105

2024

10.1088/1674-1056/ad08a6

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(1)
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