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Microstructure evolution of zircaloy-4 during Ne ion irradiation and annealing: An in situ TEM investigation

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【Author】 Shen Hua-Hai;Peng Shu-Ming;Zhou Xiao-Song;Sun Kai;Wang Lu-Ming;Zu Xiao-Tao;School of Physical Electronics, University of Electronic Science and Technology of China;Department of Materials Science and Engineering, University of Michigan;Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics;

【机构】 School of Physical Electronics, University of Electronic Science and Technology of China； Department of Materials Science and Engineering, University of Michigan； Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics；

【摘要】 The microstructural evolution of zircaloy-4 was studied, including the amorphization and recrystallization of Zr(Fe,Cr)2precipitates, and the density of dislocations under in situ Ne ion irradiation and post annealing. The results show that irradiation at a relatively high temperature and dose induces the formation of nanocrystals in pre-amorphized Zr(Fe, Cr)2precipitates. The recrystallized nanocrystals also have the structure of hcp-Zr(Fe, Cr)2. The formation of the nanocrystals is thought to be the consequence of competition between atomistic disordering and the recrystallization of precipitates under ion irradiation. The free energy of the nanocrystal is lower than that of the amorphous state, which is another reason for the recrystallization of the precipitates. With increased annealing temperature, the density of the nanocrystals is increased.The dislocation density sharply decreases with the increase in the annealing temperature, and its size increases.更多还原

【Abstract】 The microstructural evolution of zircaloy-4 was studied, including the amorphization and recrystallization of Zr(Fe,Cr)2precipitates, and the density of dislocations under in situ Ne ion irradiation and post annealing. The results show that irradiation at a relatively high temperature and dose induces the formation of nanocrystals in pre-amorphized Zr(Fe, Cr)2precipitates. The recrystallized nanocrystals also have the structure of hcp-Zr(Fe, Cr)2. The formation of the nanocrystals is thought to be the consequence of competition between atomistic disordering and the recrystallization of precipitates under ion irradiation. The free energy of the nanocrystal is lower than that of the amorphous state, which is another reason for the recrystallization of the precipitates. With increased annealing temperature, the density of the nanocrystals is increased.The dislocation density sharply decreases with the increase in the annealing temperature, and its size increases.更多还原

【关键词】 recrystallization； dislocation； radiation damage； zircaloy-4；
【Key words】 recrystallization； dislocation； radiation damage； zircaloy-4；

【基金】 Project supported by the Key Laboratory of Neutron Physics of China Academy of Engineering Physics(Grant No.2012AB02);the Fundamental Research Funds for the Central Universities of China(Grant No.ZYGX2012YB017);the Major Program of the National Natural Science Foundation of China(Grant No.91126001)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2014年03期

【分类号】TB383.1
【下载频次】29

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