Effect of Low Frequency Electromagnetic Field on Microstructure of DC Casting Al-Mg-Si-Cu Aluminum Alloy Ingots
Author of the article:HAO Jianfei;WANG Shuncheng;NONG Deng;LI Runxia
Author's Workplace：School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Guangdong Institute of Materials and Processing,Guangzhou 510651,China;School of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523808,China
Key Words：electromagnetic oscillation solute elements microstructure macrosegregation
Abstract：The Al-Mg-Si-Cu aluminum alloy ingots were prepared by using low frequency electromagnetic field semi-continuous casting process. The effect of low frequency electromagnetic field on the microstructure of Al-Mg-Si-Cu alloy ingots was studied. The results show that the grain structure of Al-Mg-Si-Cu alloy ingots can be refined by applying low frequency electromagnetic field, and the segregation degree of the elements inside the ingots can be reduced.Compared with conventional semicontinuous casting, the applied frequency is 20 Hz, current is 120 A alternating electromagnetic field, the isometric microstructure increase in ingot casting, dendritic structure, grain size more small, ingot casting side and the center of the average grain size by regular semi-continuous casting of 170 and 259 μm down to 133 and 187 μm respectively, at the same time to improve the distribution of solute elements in the intracrystalline, greatly reduce the segregation of solute elements. In addition, the low frequency electromagnetic field in the electromagnetic oscillation makes liquid hole inner temperature field and flow field more uniformly, solute elements distribution coefficient increases, crystallization range smaller, inhibits the growth of dendrites, promoted the Al-Mg-Si-Cu alloy semi-continuous casting non-dendritic structure formation and forced solid solution of solute elements, and suppress the segregation of solute elements.
