电磁搅拌制备铝合金半固态浆料的实验研究

Experimental Research on Preparing Semi-solid Slurry of Aluminum Alloy by Electromagnetic Stirring

采用不同的搅拌功率对铝合金熔体进行电磁搅拌,观察与分析几种搅拌工艺下得到的材料显微组织。结果表明:在电磁力的作用下,熔体内部产生强烈的对流运动,晶粒间不断发生碰撞和摩擦,枝晶被打断,使晶粒变得圆整。在一定范围内,随着单位搅拌功率的升高,搅拌电磁力增大,所得组织更加细密,颗粒更加圆整,满足了半固态浆料的制备要求。

The melt of aluminum alloy in the electromagnetic field was stired by different stirring power and the microstructure of the material that was got from different stirring technology was observed. The results show that intensive convective movement is generated in the inner melt with the action of the electromagnetic force, Pine-tree crystal is broken, and the crystal grain became spherical because of the collision and friction among the crystal grains. With the increasing of stirring power, the electromagnetic force of stirring become heavier. The structure become tighter and the crystal grain get more spherical, which meet the requirements of semi-solid slurry preparing.