Accrording to coarse structure

macrosegregation and coarse second phase existing in the traditional large scale 2219 alloy ingots

the 2219 alloy ingots with ?630 mm were fabricated by DC casting with internal electromagnetic melt treatment. The solidification microstructure and composition of the ingots were investigated by OM

spectrometer and SEM. The effects of electromagnetic melt treatment on the microstructure refinement of ingots were investigated

and the distribution law of solute elements was revealed. The results indicate that the grains of ingots prepared by the internal electromagnetic melt treatment are finer along the radial direction compared with that of ones by ordinary DC casting

of which the average size is in the range of 200～300 μm. The microstructure is evenly distributed overall with the obviously refined intermetallic compound

and the second intercrystalline phase is distributed in a discontinuous net

where Cu is more evenly distributed.