(东北大学 材料电磁过程教育部重点实验室, 沈阳 110006)
摘 要: 在7075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。
关键字: 电磁振荡;半连铸;铝合金;细化机制
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