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The effect of Sr addition on microstructure evolution of Mg-6Zn-2Al-2Ca-xSr (x = 0.5, 1, 2, 3) alloys was investigated by using scanning electron microscope (SEM), X-ray diffraction (XRD) and optical microscope. The results show that the 0.5% Sr addition can restrain the formation of β-Mg 17 Al 12 phase. The constitutional undercooling increases with Sr addition, which changes the structure from cellular to dendritic. The dendritic structure becomes more refinement with Sr addition. Furthermoredoi:10.12677/ms.2012.21008 fatcat:yix7kgpryrcgnkrymdblpu6gwa