熔体处理和双向电磁搅拌复合快速制浆技术

Rapid multiple slurry-preparation technology of melt treatment and reversible electromagnetic stirring

分析了中间合金微细粉末熔体处理工艺和双向电磁搅拌工艺中，Al-5Ti-B合金粉末粒度、粉末加入量、加入温度、静置时间、中间合金加入顺序、单向旋转时间、电源频率、浇注温度和搅拌时间等工艺参数对A356合金半固态浆料的组织和制备效率的影响规律及其原因，开发出适合于铝合金的熔体处理＋双向电磁搅拌半固态浆料复合制备技术。结果表明：该技术可在20-25s内制备出α（Al）的形状因子约为0．85、晶粒尺寸为70-80μm（空冷尺寸）的A356合金半固态浆料。

The influences and reasons of the processing parameters of melt treatment and electromagnetic stirring, namely particle size of Al-5Ti-B alloy powder, addition level, addition temperature, holding time, addition sequence of master alloys, one-way rotation time, power frequency, pouring temperature, on the microstructure of semi-solid A356 alloy slurry and the preparation efficiency were systematically studied. Based on the results, a multiple semi-solid Al alloy slurry preparation technology of melt treatment and reversible electromagnetic stirring was explored. The results show that by this technology, semi-solid A356 alloy slurry with α（Al） shape factor of about 0.85 and particle size of 70-80 μm （in air-cooling state） could be prepared in 20-25 s.