The effects of mischmetal Pr / Ce on microstructures and mechanical properties of ADC12 alloy were investigated by means of optical microscopy,scanning electron microscopy,and energy dispersive spectrometry. The experiment results show that the microstructures of the alloy can be refined significantly when 0.6wt.% Pr / Ce is added to the alloy. Coarse dendritic crystals of primary α-A1 phases are tiny,and some grains are round. The morphology of iron-rich phase is changed into particle-like shape from origi...