Homogenizing treatment of high strength aluminium alloy cast under electric magnetic field

The microstructure of aluminium alloy and the distributions of the alloying elements in the billet produced by electric magnetic casting before and after homogenizing treatment were studied by optical microscope, scanning electron microscopy and electron microprobe analysis. And the overheat temperature of the homogenizing was established. Meanwhile, the diffusion kinetics of the alloy elements during the homogenizing treatment was studied. As a result, the homogenizing equation was deduced. The best homogenizing regulation of AlZnMgCu alloy is the annealing at 450 ℃ for 24 h.