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Phase field lattice Boltzmann model for non-dendritic structure formation in aluminum alloy from LSPSF machine
Affiliation:1. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China;2. Key Laboratory of Near Net Forming in Jiangxi Province, Nanchang 330031, China;3. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;1. General Research Institute for Non-ferrous Metals, 101407, Beijing, China;2. School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China;3. Department of Mechanical and Energy Engineering, Southern University of Science and Technology, 518055, Shenzhen, China;1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. IMDEA Materials Institute, 28906 Getafe, Madrid, Spain;1. Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China;2. MOE Key Laboratory of Material Physics and Chemistry under Extraordinary, Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Northwestern Polytechnical University, Xi’an 710129, China;3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Science, 100190 Beijing, China;4. R & D Department, China Academy of Launch Vehicle Technology, Beijing 100048, China;5. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Abstract:The formation of non-dendritic structures in the primary phase of an aluminum alloy solidified using low superheat pouring with a shearing field (LSPSF) machine was investigated by numerical simulation. The growth and motion of a dendrite during solidification was simulated by a combination of the lattice Boltzmann method and the phase field method. The simulation results indicated that enough shear flow helped homogenize the concentration fields, rotate crystals and altere microstructures from dendritic to non-dendritic. The interaction of grains was also discussed. A fragmentation criterion was established based on partial remelting of dendrite arms; fragmentation was enhanced by a strong shear flow and larger inclined angles. The simulation results were verified experimentally.
Keywords:numerical simulation  non-dendritic structure  low superheat pouring with shearing field (LSPSF)  aluminum alloy  phase field method  lattice Boltzmann method
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