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Defects evolution and element segregation of Ni-Mo-Cr alloy irradiated by 30 keV Ar ions
Liu Min,Liu Wenguan,He Xiujie,Gao Yantao,Liu Renduo,Zhou Xingtai 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
In present study, TEM foils of Ni-Mo-Cr alloy were directly irradiated with 30 keV Ar ions to allow direct characterization. The defects evolution and element segregation after irradiation were investigated by TEM and HAADF-EDS linear scanning. At low irradiation doses (1.38 and 2.76 dpa), black dots were formed and grew with increasing dose. Complicated defects including peas-shaped dislocation loops, polygon dislocation networks and large loops were visible in samples irradiated to high doses (13.8 and 27.6 dpa). Meanwhile, dislocation channels appeared, in which defects were swept out. Significant Mo depletions at dislocation lines and grain boundaries were induced by irradiation due to large misfits between Mo-Ni atoms and high content of Mo.
Behavior Characteristics of Hydrogen and its Isotope in Molten Salt of LiF-NaF-KF (FLiNaK)
Youshi Zeng,Wenguan Liu,WeiLiu,Yuan Qian,Nan Qian,Xiaoling Wu,Yu Huang,Shengwei Wu,Guanghua Wang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.2
Experimental studies to investigate the behaviors of hydrogen in molten FLiNaK (LiF-NaF-KF) have beenconducted at 500e700 C. On the basis of previous studies, the diffusivity and solubility of hydrogen inFLiNaK have been revised, and the expressions can be correlated to the following Arrhenius equations:DH2 ¼ 1.62 10 5exp ( 48.20 103/Rg$T) [m2/s] and SH2 ¼ 1.03 10 4exp ( 14.96 103/Rg$T) [mol-H2/m3/Pa], respectively. The behavior characteristics of deuterium in FLiNaK were studied and comparedwith the hydrogen behaviors in FLiNaK. The results showed the behaviors of deuterium were consistencewith the behaviors of hydrogen in FLiNaK. The difference between hydrogen and deuterium has not beenobserved upon the experimental research of the behavior characteristics of hydrogen and deuterium inFLiNaK, which suggested the results obtained here might apply equally to the behavior characteristics oftritium in FLiNaK.