(東北大學(xué) 材料電磁過(guò)程教育部重點(diǎn)實(shí)驗(yàn)室， 沈陽(yáng) 110004)
摘 要: 在半連鑄7075鋁合金過(guò)程中， 通過(guò)同時(shí)施加穩(wěn)恒磁場(chǎng)和交變磁場(chǎng)的方法， 使凝固熔體產(chǎn)生受迫振蕩，研究了電磁振蕩的強(qiáng)度和頻率對(duì)晶粒細(xì)化的影響規(guī)律。 對(duì)電磁振蕩作用下， 合金凝固組織的細(xì)化機(jī)理進(jìn)行了探討。 結(jié)果表明： 電磁振蕩法獲得的晶粒尺寸要較CREM法所獲得的小， 且隨著電磁振蕩強(qiáng)度增加及頻率降低， 鑄錠整體組織變得更加細(xì)小和均勻。
關(guān)鍵字: 電磁振蕩； 半連鑄； 鋁合金； 細(xì)化機(jī)制
produced by semi-continuous casting in electromagnetic vibration
（Key Laboratory of Electromagnetic Processing of Materials for Ministry of Education, Northeastern University,
Shengyang 110004, China）
Abstract:The influence of the intensity and frequency of electromagnetic vibration produced by simultaneous application of a stationary magnetic field and a periodic magnetic field, on grain refinement of 7075 aluminum alloy cast by semi-continuous casting process, was examined. The refinement mechanism of electromagnetic vibration on alloy microstructure was also discussed. The results show that the mean grain size obtained by this electromagnetic vibration method is smaller than that produced by CREM process. And with the increase of electromagnetic intensity and the decrease of electromagnetic frequency , the microstructure of ingot becomes more fine and uniform.
Key words: electromagnetic vibration; semi-continuous casting; aluminum alloy; mechanism of refinement
