(1. 清华大学 机械工程系，北京 100084;
2. 金堆城钼业集团有限公司，西安 710075)
摘 要: 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20~25 s内制备出α(Al)的形状因子约为0.85、晶粒尺寸为70~80 μm(空冷尺寸)的A356合金半固态浆料。
关键字: Al-5Ti-B微细粉末；A356合金；浆料快速制备；熔体处理；双向电磁搅拌
treatment and reversible electromagnetic stirring
（1. Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China;
2. Jinduicheng Molybdenum Group Co. Ltd., Xi’an 710075, China）
Abstract: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.
Key words: Al-5Ti-B alloy powder; A356 alloy; rapid slurry preparation technology; melt treatment; reversible electromagnetic stirring
