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Solid-State Reaction and Vacancy-Type Defects in Bilayer Fe/Hf Studied by the Slow Positron Beam
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作者 K. Yamada T. Sasaki +5 位作者 T. Nagata I. Kanazawa R. Suzuki T. Ohdaira K. Nozawa F. Komori 《Journal of Applied Mathematics and Physics》 2015年第2期233-239,共7页
The positron annihilation lifetimes and the Doppler broadening by slow positron beam are measured in thin Fe films with thickness 500 nm, a thin Hf film with thickness 100 nm, and the bilayer Fe (50 nm)/Hf (50 nm) on ... The positron annihilation lifetimes and the Doppler broadening by slow positron beam are measured in thin Fe films with thickness 500 nm, a thin Hf film with thickness 100 nm, and the bilayer Fe (50 nm)/Hf (50 nm) on quartz glass substrate. We have analyzed the behavior in vacancy-type defects in each layer through some deposition temperatures and annealing. It is observed that the thin Fe film, the thin Hf film, and the bilayer Fe (50 nm)/Hf (50 nm) already contain many vacancy-type defects. We have investigated the change of densities of the vacancy-carbon complex and the small vacancy-cluster with carbons, through solid-state amorphization of Fe (50 nm)/Hf (50 nm) bilayer. 展开更多
关键词 Metallic Films POSITRON ANNIHILATION Measurement SOLID-STATE Reaction FE Film Diffusion vacancy-type Defects
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Effect of Cu on the boron segregation at grain boundaries and vacancy-type defects in ultra-low carbon micro-alloy steels 被引量:3
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作者 YANG RuiJie WU Ping +4 位作者 LI XiangLong ZHANG ShiPing CHEN Sen WANG BaoYi JU Xin 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第6期1135-1141,共7页
By thermal neutron irradiation particle tracking autoradiography(PTA)technique,the development of boron segregation at grain boundaries in ultra-low carbon micro-alloy steels was investigated during cooling from 1150&... By thermal neutron irradiation particle tracking autoradiography(PTA)technique,the development of boron segregation at grain boundaries in ultra-low carbon micro-alloy steels was investigated during cooling from 1150°C to 850°C,and the effect of Cu on boron segregation at grain boundaries was discussed.By positron annihilation lifetime(PAL)technique,the changes of vacancy-type defects with temperatures and the effect of Cu on vacancy-type defects in the cooling process were discussed.Results show that,the concentration of boron at grain boundaries increases rapidly at the beginning of the cooling;after that,it begins to decrease;and then,it increases gradually again.The addition of Cu not only increases the concentration of boron at grain boundaries but also speeds up the development process of boron segregation at grain boundaries.During the continuous cooling process,the addition of Cu significantly affects the change of vacancy-type defects with temperatures in ultra-low carbon micro-alloy steels. 展开更多
关键词 particle tracking autoradiography(PTA) technique boron segregation at grain boundaries positron annihilation lifetime(PAL) technique vacancy-type defects ultra-low carbon micro-alloy steels
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Formation of Vacancy-Type Dislocation Loops in Hydrogen-Ion-Implanted Fe–Cr Alloy 被引量:1
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作者 Yu-Feng Du Li-Juan Cui +1 位作者 Wen-Tuo Han Fa-Rong Wan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2019年第5期566-572,共7页
Fe-10 at.%Cr alloy was implanted with hydrogen ions at room temperature, followed by annealing at high temperatures.The annealing process made the defects develop into large dislocation loops. The nature of the disloc... Fe-10 at.%Cr alloy was implanted with hydrogen ions at room temperature, followed by annealing at high temperatures.The annealing process made the defects develop into large dislocation loops. The nature of the dislocation loops formed after annealing was studied by the evolution of loops under in situ electron irradiation in high-voltage electron microscope.It indicated that only interstitial-type loops were observed when annealed at 550 °C and below, but vacancy-type loops started to form at the temperature higher than 600 °C. According to the previous study of our group, the presence of chromium element made the formation temperature of vacancy-type loops higher than that in pure iron. The effect of alloying elements on the formation temperature of the vacancy-type loops was discussed. 展开更多
关键词 Hydrogen implantation Interstitial-type LOOPS vacancy-type LOOPS Fe–Cr ALLOY High-voltage electron microscope
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