| Effects of electromagnetic stirring on microstructures of solidified aluminum alloys |
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| 作者姓名： | 时海芳 张伟强 |
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| 作者单位： | School of Mechanical Engineering Liaoning Technical University，Fuxin123000，China，School of Mechanical Engineering Liaoning Technical University，Fuxin123000，China |
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| 摘 要： | 1 INTRODUCTIONPractically ,mechanicalstirringandelectromag neticstirring (EMS)arewidelyusedtogenerateforcedflowinsolidificationandcastingofmetalsandalloys,resultingin greatchangesofthesolidifiedstructures,segregationsand propertiesofthecast ings .Muchattentionhasbeenpaidtosolidificationofdendriticalloyssuperposedwithforcedflow ,andmanypreviousworkshavebeenfocusedontheeffectsoffluidflowonthestructuraltransitions,suchascolumnar equiaxedtransitions(CET)ormacro segre gationinthealloys13] .…
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Effects of electromagnetic stirring on microstructures of solidified aluminum alloys |
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| SHI Hai fang,ZHANG Wei qiang.Effects of electromagnetic stirring on microstructures of solidified aluminum alloys[J].Transactions of Nonferrous Metals Society of China,2003,13(5). |
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| Authors: | SHI Hai fang ZHANG Wei qiang |
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| Abstract: | Al-20%Cu, Al-33%Cu and Al-7%Si alloys were solidified with electromagnetic stirring(EMS). The fluid flow induced by electromagnetic stirring leads to the increases of the lamellar spacing of Al-CuAl2 and Al-Si eutectics and the secondary dendritic arm spacing. Rod-like eutectic structure plus pro-eutectic α(Al) are observed in Al-Cu eutectic alloy when the agitating voltage is increased over 130 V, and in the hypoeutectic alloys, globular grains of proeutectic α(Al) grains may form when the magnetic field is strong enough. The Si flakes in the Al-Si eutectic are also coarsened by applying forced flow during solidification, which is always related to the depression of their branching in the growth by the forced convection. |
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| Keywords: | electromagnetic stirring fluid flow eutectic solidification |
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