Microstructure and mechanical properties of laser beam welded Al–Li alloy 2060 with Al–Mg filler wire |
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| Affiliation: | 1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, China;3. Beijing Institute of Astronautics Systems Engineering, Beijing 100076, China;4. Capital Aerospace Machinery Company, Beijing 100076, China;1. School of Materials Science and Engineering, Central South University, Changsha, PR China;2. School of Materials, University of Manchester, Manchester, UK;3. College of Mechanical and Electrical Engineering, Central South University, Changsha, PR China;4. Shanghai Aircraft Design and Research Institute, Shanghai, PR China;1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;3. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;4. China Academy of Launch Vehicle Technology, Beijing 100076, China;5. Tianjin Long March Launch Vehicle Manufacturing Co., Ltd., Tianjin 300462, China;6. Capital Aerospace Machinery Corporation Limited, Beijing 100076, China;1. Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;2. Science and Technology on Power Beam Lab, Beijing Aeronautical Manufacturing Technology Research Institute, China |
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| Abstract: | Alloy 2060-T8 is a newly developed high-strength Al–Li alloy for applications in aircraft industry. Crack-free welds were obtained in laser beam welding with 5087 filler wire under optimized welding conditions. In this paper, fusion zone microstructure and joint mechanical properties were investigated. Microstructure typical for the weld metal consists of α-Al matrix with a few nanoscale precipitates inside and a coarse icosahedral quasicrystalline T2 phase at the dendritic and grain boundaries. The quasicrystalline occurred normally in Al–Li–Cu alloys with higher Li contents. Our investigations show that the icosahedral quasicrystalline phase T2 phase forms in the laser-welded Al–Li alloy 2060 with lower Li content as a result of segregation and replacement of Mg element. The joint tensile strength in as-welded condition is around 317 MPa, about 63% of that of the base metal, and fracture occurs within the fusion zone. |
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