(東北大學(xué) 材料電磁過程教育部重點(diǎn)實(shí)驗(yàn)室， 沈陽 110006)
摘 要: 在7075鋁合金半連鑄過程中，通過同時施加一個穩(wěn)恒磁場和一個交變磁場，使金屬熔體產(chǎn)生受迫振蕩的方法。實(shí)驗(yàn)研究了電磁振蕩強(qiáng)度對晶粒細(xì)化的影響規(guī)律。結(jié)果表明：電磁振蕩法獲得的鋁合金晶粒尺寸較CREM法的小，且隨著電磁振蕩強(qiáng)度的增加，鑄錠微觀組織變得更加細(xì)小和均勻。對在電磁振蕩作用下，合金凝固組織的細(xì)化機(jī)理進(jìn)行了探討。
關(guān)鍵字: 電磁振蕩；半連鑄；鋁合金；細(xì)化機(jī)制
intensity on microstructural refinement
of aluminum alloy produced by
semi-continuous casting
（The Key Laboratory of Ministry of Education for Electromagnetic Processing of
Materials，Northeastern University，Shenyang 110004，China）
Abstract: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 m ore fine and uniform. Moreover，the refinement mechanism of alloy microstructure under electromagnetic vibration is also discussed.
Key words: electromagnetic vibration；semi-continuous casting；aluminum alloy；mechanism of refinement
