Abstract: When adding different amount of Al-Ti-B refiner(0.4%， 0.2% and 0.1%) in the 1100 aluminum alloy sheet， the effects of electromagnetic oscillating field on refining microstructure of the sheet during roll casting were investigated. The results show that the refining effects on the microstructure of the roll-casted sheet were significant after applying electromagnetic oscillating field compared with that in the traditional roll-casted one. Also，when the refiner content was within the scope of 0.1% to 0.4%， the refining effect of electromagnetic field was prominent and the refining microstructure was superior to that in the traditional roll-casted one with adding 0.4% refiner. Therefore， the electromagnetic vibration roll casting process can decrease the amount of the refiner greatly， reduce element segregation and improve internal quality in a roll-casted billet.

Key words: electromagnetic oscillating field, 1100 aluminum alloy, roll casting, refiner, microstructure