Surface treatment of aluminum by high current pulsed electron beam |
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| Institution: | 1. State Key Laboratory for Material Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China;2. Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China;3. Foundry Engineering Center, Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China;4. Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China;1. Institute of Physics, The Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague, Czech Republic;2. Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 27, 16627 Prague, Czech Republic;1. Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang, 212013, China;2. School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, China;3. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China;4. School of Material Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, China;1. Faculty of Mechanical Engineering, Semnan University, Semnan, Iran;2. Institute of Strength Physics and Materials Science of the Siberian Branch of Russian Academy of Sciences, Tomsk, Russia;1. Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang 212013, China;2. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;3. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;4. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;5. College of Science, Civil Aviation University of China, Tianjin 300300, China;1. China International Science & Technology Cooperation Base for Laser Processing Robotics, Wenzhou University, Wenzhou, 325035, China;2. Zhejiang Provincial Key Laboratory of Laser Processing Robotics, College of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou, 325035, China;3. Key Laboratory of Materials Modification By Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian, 116024, China;4. School of Material Science and Engineering, Dalian Jiaotong University, Dalian, 116021, China |
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| Abstract: | The development of advanced technology based on the interaction of high current pulsed electron beam (HCPEB) with solid materials is very important at present time R. Stark, J. Christiansen, et al., IEEE Trans. Plasma Sci. 23 (3) (1995) 258–264; T. Witke, A. Lenk, B. Schultrich, IEEE Trans. Plasma Sci. 24 (1) (1996) 61–62]. When the concentrated electron flux are acting on a material, superfast processes such as heating, melting, and solidification, as well as dynamic stresses induced in the processes impart surface layer with improved physical, chemical and mechanical properties unattainable with conventional surface treatment methods. This paper reports on an investigation on pure aluminum treated by “Nadezhda-2” HCPEB device. The extreme surface is melted to a depth of about 1 μm at the input energy density of 3 J/cm2. Craters, micrometers in size, are formed in the melted surface. Vacancy and dislocations are significantly increased near the surface as a result of the electron bombardment. Based on the microhardness distribution measured on the cross-section, it has been established that the thickness of the modified layer is several hundreds of micrometers beneath the surface, significantly greater than that of the heat-affected zone. The experimental results are compared with those obtained by solving numerically the heat and stress equations, with finite difference and finite element methods, taking into account of the processes of melting and changing of physics parameters related to changing temperature. Satisfactory agreement between experimental and theoretical data is obtained. |
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