Phase-field simulation of structure evolution at high growth velocities during directional solidification of Ti55Al45 alloy |
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| Affiliation: | 1. Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo–ku, Kyoto 606–8585, Japan;2. Faculty of Mechanical Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo–ku, Kyoto 606–8585, Japan;3. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita–ku, Sapporo 060–8628, Japan;4. Department of Materials Engineering, The University of Tokyo, 7–3–1 Hongo, Bunkyo–ku, Tokyo 113–8656, Japan;1. Center for Hierarchical Materials Design, Northwestern University, 2205 Tech Drive, Suite 1160, Evanston, IL 60208, USA;2. Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA;3. Department of Materials Science and Engineering, University of Michigan, 2300 Hayward Street, Ann Arbor, MI 48109, USA;4. Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, MS 8300, Gaithersburg, MD 20899-8300, USA;5. Northwestern-Argonne Institute of Science and Engineering, 2205 Tech Drive, Suite 1160, Evanston, Illinois 60208, USA;6. Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA;7. Department of Experimental Solid State Physics, Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, 29-33, Konkoly-Thege Miklós út, Budapest H-1121, Hungary;1. Fuels Modeling and Simulation Department, Idaho National Laboratory, Idaho Falls, ID 83415, United States;2. Mechanical and Nuclear Engineering Department, Pennsylvania State University, University Park, PA 16802, USA;3. Modeling and Simulation Department, Idaho National Laboratory, P.O. Box 1625, Idaho Falls, ID 83415, USA;1. Space Environment Simulation Research Infrastructure, Harbin Institute of Technology, Harbin 150001, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;3. Institute of High Performance Computing, A*STAR, Singapore 138632, Singapore;4. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;5. State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan;2. Faculty of Mechanical Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan;3. Department of Mechanical Engineering, Escuela Politecnica Nacional, Ladron de Guevara E11-253, 17-01-2759 Quito, Ecuador;4. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan;5. Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;6. Global Scientific Information and Computing Center, Tokyo Institute of Technology, 2-12-1 i7-3 i7–3 O-okayama, Meguro-ku, Tokyo 152-8550, Japan;1. Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou University of Light Industry, Zhengzhou, 450002, China;2. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai, 200240, China;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA |
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| Abstract: | A phase-field model whose free energy of the solidification system is derived from Calphad thermodynamic modeling of phase diagram is used to simulate structure evolution of Ti55Al45 alloy during directional solidification at growth velocities sufficiently higher than the critical velocity of transition from cells to dendrites, but lower than the absolute stability. The liquid–solid phase transition of L→L+β(Ti) is chosen. Firstly, the dynamics of the breakdown of initially planar interfaces into cellular structures then cellular dendrites are shown. Then the transition from cellular dendrites to fine cellular structures are shown at higher growth velocities. The solute segregation patterns are investigated at different growth velocities. The appearance of solute trapping is also investigated by determining the solute partition coefficients as a function of growth velocities. Agreement is reached with the theory of rapid directional solidification. |
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