Grain refinement and macrosegregation behavior of direct chill cast Al-Zn-Mg-Cu alloy under combined electromagnetic fields  

作　　者：Yu-bo Zuo Xu-dong Liu Chao Sun Sen-sen Yuan Dan Mou Zhan-zhi Li Jian-zhong Cui 

机构地区：[1]Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University [2]Giant Light Metal Technology (Kunshan) Co., Ltd.

出　　处：《China Foundry》2015年第5期333-338,共6页中国铸造（英文版）

基　　金：supported by the National Natural Science Foundation of China(51374067);the Outstanding Young Scholars'Growth Plan in the Colleges and Universities of Liaoning Province(LJQ2014032);the National Basic Research Program of China(2012CB619506)

摘　　要：The combined electromagnetic fields were achieved by the application of an alternating magnetic field and a stationary magnetic field and were used during direct chill(DC) casting process to control the microstructure and macrosegregation of an Al-Zn-Mg-Cu alloy. Ingot microstructures were analyzed under an optical microscope(Leica DMR). The composition at different locations in the ingots was measured with inductively coupled plasma mass spectrometry(ICP) method. The results showed that the grain structure is transformed from dendrite to equiaxed structure and significantly refined with the application of combined electromagnetic fields. The uniformity of microstructure is also greatly improved. The combined electromagnetic fields show a significant effect on the distribution of elements. The negative macrosegregation in the centre area of the ingot is obviously reduced.The combined electromagnetic fields were achieved by the application of an alternating magnetic field and a stationary magnetic field and were used during direct chill（DC） casting process to control the microstructure and macrosegregation of an Al-Zn-Mg-Cu alloy. Ingot microstructures were analyzed under an optical microscope（Leica DMR）. The composition at different locations in the ingots was measured with inductively coupled plasma mass spectrometry（ICP） method. The results showed that the grain structure is transformed from dendrite to equiaxed structure and significantly refined with the application of combined electromagnetic fields. The uniformity of microstructure is also greatly improved. The combined electromagnetic fields show a significant effect on the distribution of elements. The negative macrosegregation in the centre area of the ingot is obviously reduced.

关 键 词：Al-Zn-Mg-Cu alloy electromagnetic field DC casting microstructure MACROSEGREGATION 

分 类 号：TG146.21[一般工业技术—材料科学与工程]