The Effect of Sr Addition on the Microstructure of Mg-6Zn-2Al-2Ca Magnesium Alloy

克强 邱
2012 Material Sciences  
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. Furthermore
more » ... non-dendritic structure is formed when Sr content is 3%. However, a paddle Mg 17 Sr 2 structure was observed when Sr content is 2% and its size increases with Sr. The structure evolution of Mg-6Zn-2Al-2Ca alloy with Sr addition was discussed.
doi:10.12677/ms.2012.21008 fatcat:yix7kgpryrcgnkrymdblpu6gwa