Effect of Cooling Rate on the Microstructure of Semi-Solid Al–25Si–2Fe Alloy During Electromagnetic Stirring |
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| Authors: | Lu Li Rong Feng Zhou Qihong Cen Dehong Lu Yehua Jiang Rong Zhou |
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| Affiliation: | 1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650039, China
2. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming, 650039, China
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| 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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