Effect of electromagnetic field on microstructure and properties of 5052 aluminum alloy sheets by roll-casting

5052 aluminum alloy sheets were produced by the conventional twin-roll casting(TRC)process with static magnetic field and alternating oscillating field, and the microstructure were investigated by optical microscopy. The results showed that when the pouring temperature is 690°C, the dendrites formed under the 0.25 T static magnetic field are refined, and the microstructure is equiaxed. However, the grains grow in non-homogeneous form, compared to the non-field sheets. Under 0.25 T static magnetic field and 450 A alternating current conditions, the central structure of the sheet consists of uniform equiaxed grains, resulting from the vibration of electromagnetic force. The highest yield strength and tensile strength are up to 122 and 235 MPa, respectively, due to the equiaxed grains formed on the entire sheet by the alternating oscillating field. In this forming condition, the most superior properties can be obtained.