The effects of Sb on microstructure and mechanical properties of Mg-3Sn-1.5Al-1Zn-1.2Si magnesium alloy were studied when Sb was added into melt in the form of pure metal with the range of 0-1.8%(mass fraction,similarly hereinafter).The results demonstrate that Sb element and Mg matrix preferentially combine to form Mg3Sb2 phases,the addition of 1.0% Sb has a strong modification for Chinese script morphology Mg2Si phases.Sn can replace Si of Mg2Si then form Sn-rich Mg2(Si,Sn)compound phase,whose physical pr...