Pulsed magnetic field（PMF）was introduced to treat melt during solidification of Mg93Zn6Y1 alloy.Effects of discharging voltage on microstructure and mechanical properties of Mg93Zn6Y1 alloy were investigated.The results show that the primaryα-Mg and quasicrystal icosahedral phase（I-phase）in the alloy can be refined by PMF treatment.With increasing in discharging voltage

the primaryα-Mg and I-phase are further refined.With discharging voltage of 300 V

the morphology of primaryα-Mg is transformed from the developed dendrite to fine rosette and particle

and I-phase is converted from coarse continuous net-like structure into discontinuous structure or particle.At the same time

the average width and average area ratio of I-phase are reduced from 26μm and 32%to 10μm and 14%

respectively.The tensile strength and elongation of Mg93Zn6Y1 alloy treated by PMF with 300 Vreach 172.1MPa and 1.6%

respectively

which are increased by 71.2% and 60.0%

respectively

compared with those of the alloy without PMF treatment.