ABSTRACT
Magnesium (Mg)-Sr master alloys with different Sr contents were also fabricated to introduce elemental Sr into the casting alloys. The degradation of Mg-Sr binary alloys in the Hank's solution resulted in the formation of a corrosion products layer mainly composed of Mg(OH)2 and HA on the sample surface. The traditional metallurgical process was used to produce the Mg-Sr-Zn alloys. The microstructure of the Mg-Sr-Mn alloys exhibited a typical cast structure with the interdendritic phases surrounding the a-Mg matrix. With the increasing Sr amount in the alloys, the interdendritic phases also increased. For the Mg-Sr-Sn alloys, the microstructure of the Mg-Sr-Sn alloys gradually changed from dendrite crystals to equiaxed grains with increasing Sr content. The addition of Zn to the Mg-Sr alloys would significantly improve the mechanical properties of the ternary alloys due to the grain refining and the increased solid solution and precipitation strengthening effect. Osteoblast-like cells were selected to evaluate the cytotoxicity of the Mg-Sr-Zr alloys by indirect assays.
