Mechanical properties and microstructure of helium-implanted beryllium |
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| Affiliation: | 1. Laboratoire PIMM, Ensam, CNRS, Cnam, HESAM Université, UMR 8006, 151 boulevard de l’Hopital, 75013 Paris, France;2. Laboratoire de Mécanique et d’Acoustique, Aix-Marseille Univ, CNRS, Centrale Marseille, UMR 7031, 4 impasse Nikola Tesla, CS 40006, 13453 Marseille Cedex 13, France;1. Institute of Strength Physics and Materials Science SB RAS, 2/4, pr. Akademicheskii, Tomsk, Russia;2. Tomsk State University, 36 Lenin Ave., Tomsk, Russia;3. A.A. Bochvar High-Technology Scientific Research Institute for Inorganic Materials, 5a Rogova St., Moscow, Russia;4. Tomsk Polytechnic University, 30 Lenin Ave., Tomsk, Russia;5. Skolkovo Institute of Science and Technology, 100 Novaya St., Skolkovo, Russia;1. CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;2. ITER Organization, Route de Vinon sur Verdon, 13115 Saint-Paul-lez-Durance, France;1. Department of Physics, Dalian Maritime University, Dalian 116026, China;2. Information Science and Technology College, Dalian Maritime University, Dalian 116026, China;3. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, China;4. Southwestern Institute of Physics, Chengdu 610041, China |
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| Abstract: | 0.2 mm thick specimens of beryllium have been homogeneously implanted with helium. Implantation temperatures ranged from 100 to 600 °C, and final helium concentrations from 30 to 800 appm. Tensile tests at temperatures between 20 and 600 °C were carried out with testing temperature both equal to and lower than the implantation temperatures. For practicality all conditions of helium-implanted specimens, ductility decreased and yield and ultimate tensile strength increased as compared to the unimplanted specimens. The amount of embrittlement and strengthening, however, depended sensitively on implantation dose, implantation temperature, and tensile test temperature. The formation of helium bubbles, dislocation loops, and dislocation networks and the fracture modes were observed by transmission and scanning electron microscopy, respectively. Two ranges of embrittlement can be distinguished. They are attributed to different mechanisms: matrix strengthening is the dominant mechanism at low temperatures, and loss of grain boundary cohesion at high temperatures. It is concluded that in both temperature regimes the embrittlement is dominated by helium and not by the displacement defects introduced by its implantation. |
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