Effect of Direct Current Electric Field on the Microstructure of ZA27 Alloy

The effect of direct current electric field on the solidified structure of ZA27 alloy has been studied. The experiment results show that under the influence of direct electric current, with the increase of the current density, the distance between the dendrites decreased. The solidified structure has been modified from large grains with Alrich dendrites to finer grains with nearly globular crystals, while the eutectic crystal structure increased. An elementary analysis was given to discuss the mechanism of the mentioned results.