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张羽廷,王鑫,刘朋闯,曾钢,庞晓轩,贾建平,盛六四,张鹏程.U-10Zr/Zr-4合金界面的微观结构及生长动力学研究[J].稀有金属材料与工程(英文),2018,47(9):2675~2681.[Yuting Zhang,Xin Wang,Pengchuang Liu,Gang Zeng,Xiaoxuan Pang,Jianping Jia,Liusi Sheng and Pengcheng Zhang.Microstructural characterization and growth kinetics of the reaction layer in U-10wt.%Zr/Zircaloy-4 diffusion couples[J].Rare Metal Materials and Engineering,2018,47(9):2675~2681.]
Microstructural characterization and growth kinetics of the reaction layer in U-10wt.%Zr/Zircaloy-4 diffusion couples
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Received:February 20, 2017  Revised:July 16, 2017
DOI:
Key words: metallic fuel  cladding  interface  interdiffusion  hybrid reactor
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),
Author NameAffiliation
Yuting Zhang,Xin Wang,Pengchuang Liu,Gang Zeng,Xiaoxuan Pang,Jianping Jia,Liusi Sheng and Pengcheng Zhang  
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Abstract:
      U-Zr alloys cladded with Zircaloy-4 alloy are being developed as metallic fuels for water-cooled reactors. The fuel-cladding compatibility is key to the safe operation of the reactors, however, there are few studies on the interfacial reaction and diffusion of U-Zr alloys and Zircaloy-4 alloy. To investigate the compatibility and the diffusion behavior between U-Zr alloys and Zr-4 alloys, solid-to-solid U-10wt.%Zr/Zr-4 diffusion couples were assembled by vacuum hot pressing and then vacuum annealed at the temperatures range from 580 ℃ to 1100 ℃ for various time. Both scanning and transmission electron microscopy were employed for analysis of the microstructures and composition profiles at the interfaces of the couples. The compatibilities between the two alloys were systematically investigated. δ-UZr2 and ~20nm-thin U-rich layers existed in vacuum hot pressed samples. The interdiffusion coefficient constant and the activation energy were measured, which are 4.23(±0.63)×10-6 m2/s and 160.73(±1.67) kJ/mol, respectively. The interdiffusion coefficients of U-10wt.%Zr/Zr-4 alloys couples are higher than that of U-Zr alloys, especially for low temperature.