摘要
以工业纯铝为研究对象,通过在铸型内放置金属网隔离的方法,研究了脉冲磁致振荡(pulsed magneto cscillation,PMO)细化工业纯铝凝固组织的机理。试验结果表明,脉冲磁致振荡能激发工业纯铝在铸型内壁、熔体液面以及固/液界面前沿处大量形核。脉冲磁致振荡技术利用高频变化的电磁场作用于熔体中并感生出振荡式电磁力,这种电磁力一方面能减小熔体内部温度梯度,从而增大形核面积;另一方面能加速晶核在液面以及固液界面处脱落并游离到整个熔体中,从而形成结晶雨效应细化金属凝固组织。
The refinement mechanism of commercial pure A1 under pulsed magneto oscillation was investigated by putting the metal gauze into the mold. The results indicated that a large amount of nuclei can be formed at the mold wall, on the surface of melt and solid/liquid interface. The technology of PMO utilizes high frequency changing electromagnetic field to induce changing electromagnetic force in the melt. The force can reduce the temperature gradient in the melt, thus increasing the surface of forming nuclei. Besides, the force can also accelerate the nuclei to separate from the surface of the melt and solid/liquid interface to the melt.
出处
《上海金属》
CAS
北大核心
2015年第4期48-51,共4页
Shanghai Metals
基金
国家973项目(大型铸锭的均质化凝固控制)(No.2011CB012902)
关键词
脉冲磁致振荡
工业纯铝
凝固组织
晶粒细化
Grain Refinement Pulsed Magneto Oscillation, Commercial Pure A1, Sofidification Structure,Grain Refinement
