Due to the large difference of melting point and wide range of crystallization temperature

the alloying of Al-Sn alloy was prone to be insufficient and the coarse dendritic structure with serious segregation was also formed easily

and different type and current intensity of electromagnetic field was applied to obtain Al-Sn alloy with uniform microstructure.The results show that electromagnetic field has a great effect on the grain refinement

and with the enhancement of electromagnetic intensity

the grain will be finer.The segregation of second phase in Al-Sn alloy is weakened

and with the increase of the current intensity

the distribution of second phase becomes more uniform.By comparing the second phase of RMF、TMF、RMF+TMF treated Al-Sn alloy

it can be concluded that the tin-rich phase is segregated with RMF

and there is absence of segregation of tin-rich phase with the TMF and TMF+RMF treatment.