电磁场对5052铝合金铸轧板材组织性能的影响

在传统铸轧过程中施加静磁场和交变振荡电磁场，生产5052铝合金板材，并主要通过显微观察，研究了铸轧工艺对板材的显微组织的影响.结果表明:在浇铸温度为690℃下，同传统工艺板材相比，施加静磁场(025T)生产的5052铝合金板材枝晶生长受到抑制，显微组织得到细化并分布均匀化，但晶粒大小不均匀；采用025T磁场和450A的交变电流生产时，产生电磁振荡效应，中心组织为均匀的等轴晶.交变振荡电磁场铸轧使整个板材等轴化效果最好.屈服强度和抗拉强度分别为122和235MPa，板材性能最优.

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℃， the dendrites formed under the 025T 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25T static magnetic field and 450A 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 235MPa， 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.