Effects of pulsed magnetic field（PMF）on the solidified microstructure and mechanical properties of in situ Mg

2

Si/Mg-7Al composites were investigated.Experimental results show that

with increasing in discharging voltage

the Mg

2

Si phase in the composites prepared is further refined

and the morphology of Mg

2

Si phase is transformed from equiaxed dendritic to particle-like structure

and the morphology ofβ-Mg17Al12 is converted from discontinuous net-like structure to island-like and particlelike ones with more uniform distribution.The mechanical properties of the composites treated by PMF were improved significantly.The tensile strength and elongation of the composites treated by PMF at300 Vare increased by 37.3% and 137.5%

respectively

compared with those of the composites untreated by PMF.