Abstract
The effect of cooling rate on the microstructure of semi-solid Al–25Si–2Fe alloy was investigated during electromagnetic stirring. It was found that as the cooling rate was increased from 7 to 21 °C/min, the equivalent diameter of the primary Si particles decreased from 70 ± 5 to 25 ± 2 μm. The primary Si particles form a fine blocky structure when the cooling rate is 21 °C/min. When the cooling rate is increased to 30 and 33 °C/min, the primary Si particles coarsen and adopt plate or other irregular shapes. As the melt cools to 690 °C, Fe inter-metallic phases present different morphologies at different cooling rates during EMS. These phases in the Al–25Si–2Fe alloy are mainly in the form of δ-Al4FeSi2 at higher cooling rates.
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References
Chol Y S, Lee J S, Kim W T, and Ra H Y, J Mater Sci 34 (1999) 2163.
Zhong G, Wu S, An P, Mao Y-W, and Li S, Trans Nonferr Met Soc China 20 (2010) 1603.
Haga T, and Kapranos P, J Mater Process Technol 130–131 (2002) 594.
Mao W, Li S, Zhao A, Cui C, and Zhong X, Mater Sci Technol 9 (2001) 117. (in Chinese).
Lu D, Jiang Y, Guan G, Zhou R, Li Z, and Zhou R, J Mater Process Technol 189 (2007) 13.
Xu C L, and Jiang Q C, Mater Sci Eng A 437 (2006) 451.
Hou L, Cai Y, Cui H, and Zhang J, Int J Miner Metall Mater 17 (2010) 297.
Mondolfo L F, Aluminum alloys: structure and properties. The Whitefriars Press Ltd., London, (1976), p 534.
Hou L G, Cui C, and Zhang J S, Mater Sci Eng A 527 (2010) 6400.
Acknowledgments
The authors acknowledge funding for this research from National Science Foundation of China (50871048) and Science and Technology Project Foundation of Yunnan Province of China (2010DH025). This work is supported by the Institute of Advanced Materials Processing, Kunming University of Science and Technology, Kunming, China.
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Li, L., Zhou, R.F., Cen, Q. et al. Effect of Cooling Rate on the Microstructure of Semi-Solid Al–25Si–2Fe Alloy During Electromagnetic Stirring. Trans Indian Inst Met 66, 163–169 (2013). https://doi.org/10.1007/s12666-012-0239-1
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DOI: https://doi.org/10.1007/s12666-012-0239-1