Helium-implanted CLAM steel and evolutionary behavior of defects investigated by positron-annihilation spectroscopy |
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| Affiliation: | 1. Department of Physics, University of Science and Technology Beijing, Beijing 100083, PR China;2. Accelerator Laboratories, School of Physics, Wuhan University, Wuhan, Hubei 430072, PR China;3. Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, PR China;1. National Fusion Research Institute, Daejeon, Republic of Korea;2. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;1. Karlsruhe Institute of Technology (KIT), Institute for Neutron Physics and Reactor Technology (INR), Germany;2. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM-WPT), Germany;3. Indian Institute of Technology Madras (IITM), Department of Mechanical Engineering, India;1. CEA, DEN, Saclay, DM2S, SERMA, F-91191 Gif-sur-Yvette, France;2. Incka, 19-21 Rue du 8 mai 1945, F-94110 Arcueil, France;1. Faculty of Engineering and Resource Science, Akita University, 1-1, Tegatagakuen-cho, Akita 010-8502, Japan;2. Fusion Research and Development Directorate, Japan Atomic Energy Agency, 2-166, Omotedate, Obuchi, Rokkasho, Kamikita, Aomori 039-3212, Japan;1. Korea Atomic Energy Research Institute, 989 Daeduck-daero, Yuseong-gu, Daejeon 305-353, Republic of Korea;2. National Fusion Research Institute, Gwahangno, Yuseong-gu, Daejeon 305-333, Republic of Korea |
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| Abstract: | China Low Activation Martensitic (CLAM) steel has been chosen as the primary candidate structural material for the first wall/blanket for fusion reactor. The excessive helium irradiation induced damage of CLAM steel at high temperatures and the evolution of defects were investigated in this paper. The samples were homogeneously implanted with 1e + 17 ions/cm2 and 100 keV of helium at room temperature, 473, 673, and 873 K. Irradiation induced damage of CLAM steel and the annealing behavior of defects were probed by slow positron beam Doppler broadening technique. Helium implantation produced a large number of vacancy-type defects which bound with helium and formed helium–vacancy complexes. Target atoms’ displacement capacity was strengthened with rising irradiation temperatures, so the S parameter increased with increasing irradiation temperatures, and helium–vacancy complexes were main defects after helium implantation at damage layers. Helium bubbles would be unstable and the desorption of helium bubbles would promote the density of defects above 673 K. By analyzing the curves of S–W and annealing tests of irradiated specimen, it suggested that there werenot only one type of defect in damage layers. Though helium–vacancy complexes were primary defects after helium implanted, introducing excessive helium might also generated other point defects or dislocation loops in the material. |
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| Keywords: | CLAM Helium irradiation Positron annihilation Defects |
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