电磁振荡频率对半连铸7075 Al合金微观组织的影响  

Influence of Electromagnetic Vibration Frequency 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：《材料导报》2003年第2期79-81,共3页Materials Reports

基　　金：国家重大基础发展规划项目("973")(项目编号:G199906490501)

摘　　要：采用同时施加一个稳恒磁场和一个交变磁场的方法,在半连铸7075铝合金过程中,使凝固熔体产生受迫振荡。实验研究了电磁振荡的频率对晶拉细化的影响规律,结果表明电磁振荡法获得的晶粒尺寸比CREM法的小,且随着电磁振荡频率降低,铸锭整体组织变得更加细小和均匀。并对电磁振荡作用下,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 cast by semi-continuous casting was examined,with a stationary magnetic field and a periodic one simultaneously applied.The results show that the mean grain size obtained by this electromagnetic vibration method is smaller than that produced by CREM process.And with decreasing electromagnetic frequency,the microstructure of ingot becomes finer and more uniform.Moreover,the mechanism of alloy microstructure refinement by electromagnetic vibration is also discussed.

关 键 词：电磁振荡 频率 7075Al合金 微观组织 半连铸 铝合金 细化机制 

分 类 号：TG249.7[金属学及工艺—铸造] TG27