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

作　　者：申华海 彭述明 周晓松 孙凯 王鲁闽 祖小涛 

机构地区：[1]School of Physical Electronics, University of Electronic Science and Technology of China [2]Department of Materials Science and Engineering, University of Michigan [3]Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics

出　　处：《Chinese Physics B》2014年第3期441-445,共5页中国物理B（英文版）

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)

摘　　要：The microstructural evolution of zircaloy-4 was studied, including the amorphization and recrystallization of Zr（Fe, Cr）2 precipitates, 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）2 precipitates. 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.The microstructural evolution of zircaloy-4 was studied, including the amorphization and recrystallization of Zr（Fe, Cr）2 precipitates, 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）2 precipitates. 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.

关 键 词：RECRYSTALLIZATION DISLOCATION radiation damage ZIRCALOY-4 

分 类 号：TB383.1[一般工业技术—材料科学与工程]