The results revealed that the microstructure of Mg-4%Zn alloy is significantly refined with addition of 0.3%Ca. And with increasing Ca addition the mechanical properties of Mg-4%Zn alloy are increased rapidly at first and then decreased slowly.

• 结果发现；只要加入0.；3%25的Ca就可使晶粒大为细化；而随着Ca含量的增加；Mg-4%25Zn-Ca合金的抗拉强度呈先快速增加后缓慢降低的趋势;