The combined effect of melt stirring and ultrasonic agitation on the degassing efficiency of AlSi9Cu3 alloy |
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| Authors: | H. Puga J.C. Teixeira J. Barbosa E. Seabra S. Ribeiro M. Prokic |
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| Affiliation: | 1. Universidade do Minho, Departamento de Engenharia Mecânica, 4800-058 Guimarães, Portugal;2. FEUP, Departamento de Engenharia Metalúrgica e de Materiais, 4200-465 Porto, Portugal;3. MP Interconsulting, 2400 Le Locle, Switzerland;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Materials Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA;1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China;2. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang 110819, People’s Republic of China;1. National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China;2. State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization, Kunming 650093, PR China;3. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;1. BCAST, Brunel University London, Uxbridge UB8 3PH, UK;2. MEMS, Oxford Brookes University, MEMS, Oxford OX33 1HX, UK;3. CSEG, University of Greenwich, SE10 9LS, UK;4. School of Engineering & Computer Science, University of Hull, Hull HU6 7RX, UK;5. Tomsk State University, Tomsk 634050, Russian Federation |
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| Abstract: | The combined effect of high intensity ultrasound and melt stirring on the degassing of AlSi9Cu3 using simultaneously the novel MMM (Multi-frequency Multimode Modulated) ultrasonic technology to promote cavitation, and low frequency mechanical vibration to induce melt stirring, was studied. On a first stage single low frequency mechanical vibration experiments were carried out in water in order to visualize and characterize its individual effect on the liquid dynamics. On a second stage ultrasonic vibration combined with different mechanical vibration frequencies, melt temperatures and processing times were tested in liquid AlSi9Cu3 alloy and their influence on the degassing efficiency was evaluated and compared with the results of the single MMM ultrasonic degassing technique. Fixed ultrasonic parameters (frequency and electric power) were used, according to the best results obtained in former experimental works developed by the authors. For the experimental conditions used in this research, it was found that melt stirring significantly improves degassing efficiency, and such improvement depends on the metal temperature and the mechanical vibration frequency. The experimental results suggest that combining melt agitation and ultrasonic vibration it is possible to achieve almost the aluminum alloy theoretical density without increasing the processing time. |
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