电磁振荡强度对半连铸7075铝合金微观组织的影响  

Influence of electromagnetic vibration intensity on microstructural refinement of aluminum alloy produced by semi-continuous casting

作　　者：张勤 崔建忠[1] 路贵民[1] 张北江[1] 

机构地区：[1]东北大学材料电磁过程教育部重点实验室,沈阳110006

出　　处：《中国有色金属学报》2002年第z1期222-226,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划资助项目 (G199990 6 490 5 0 1)

摘　　要：在 70 75铝合金半连铸过程中 ,通过同时施加一个稳恒磁场和一个交变磁场 ,使金属熔体产生受迫振荡的方法。实验研究了电磁振荡强度对晶粒细化的影响规律。结果表明 :电磁振荡法获得的铝合金晶粒尺寸较CREM法的小 ,且随着电磁振荡强度的增加 ,铸锭微观组织变得更加细小和均匀。对在电磁振荡作用下 ,合金凝固组织的细化机理进行了探讨。The influence of the intensity of electromagnetic vibration on the microstructure of 7075 alloy ingot produced by semi continuous casting was examined, when a stationary magnetic field and a periodic magnetic field were simultaneously applied. The results show that the mean grain size obtained by this electromagnetic vibration method is smaller than that of produced by CREM process. And with the increase of electromagnetic vibration intensity, the microstructure of ingot becomes more fine and uniform. Moreover, the refinement mechanism of alloy microstructure under electromagnetic vibration is also discussed.

关 键 词：电磁振荡 半连铸 铝合金 细化机制 

分 类 号：TG249.7[金属学及工艺—铸造] TG111.4