摘要
Cr-coated zirconium alloy was prepared by pulsed laser deposition(PLD)for the application of accident-tolerant fuel cladding in light water reactors.The microstructural characteristics of the Cr coating and its evolution with temperature were investigated using grazing incidence X-ray diff raction and in situ heating transmission electron microscopy(TEM).Results show that the microstructure of the laser-deposited Cr coatings consists mainly of fine and non-specific shaped nano-crystals in the inner layer and columnar crystals in the outer layer.The recrystallization of the Cr-coating layer starts at 300–400℃ to release the high strain introduced by PLD,and the grain coalescence starts at temperatures>400°C.Upon annealing,the(110)-texture gradually intensifi es because of its high reticular density and low close-packed energy.Additionally,in situ heating TEM observation shows the presence of cavities on the Cr–Zr interface,which may result from the interdiff usion and/or the transformation from amorphous to crystalline.
基金
supported by the Ministry of Education,Culture,Sport,Science and Technology of Japan(MEXT)Innovative Nuclear Research and Development Program(Grant No.JPMXD0220354500)
Japan Atomic Energy Agency(JAEA)Nuclear Energy S&T and Human Resource Development Project through Concentrating Wisdom(Grant No.JPJA20P20337528)
the Collaborative Research Project at the Nuclear Professional School,School of Engineering,the University of Tokyo
the continuous support from the China Scholarship Council(CSC)。
