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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. 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 The combination of microstructures is also greatly improved. The combined electromagnetic fields show a significant effect on the distribution of elements. The negative macrosegregation in the center area of the ingot is obviously reduced.