旋转磁场对Al-Cu合金凝固组织动力学行为的影响

来源期刊：有色金属2011年第1期

论文作者：杨效田 李霞 李锡恩 李文生

文章页码：14 - 18

关键词：金属材料； Al-Cu合金； 旋转磁场； 凝固组织

Key words：metal material； rotating magnetic field； Al-Cu alloy； solidification structure

摘    要：以Al-(4%~5%)Cu合金为试验材料,研究旋转磁场环境对Al-Cu合金凝固组织的影响。将装于Φ16mm坩埚中Al-Cu合金在电阻炉中加热熔化,然后迅速放置于旋转磁场之中,让其在旋转磁场中冷却凝固。采用光学显微镜观察合金凝固组织变化。结果发现,旋转磁场对合金的凝固组织产生明显的细化效果,使粗大的树枝晶破碎,凝固组织不再是树枝晶结构,而呈现近等轴晶颗粒,分布较均匀,晶间距也明显减小。同时发现,不同的磁场强度对合金的凝固组织形貌有不同的影响,从细化晶粒角度讲,100V电压产生的磁场最有利于晶粒细化,过高或过低的磁场强度都不利于晶粒细化。

Abstract: With Al-(4%~%5)Cu alloy as experiment material,the effect of rotating magnetic field on the solidification structure is investigated.The test material kept in ceramic tube of(16mm is heated to melt in resistance-heated furnace,and then is quickly removed into the rotating magnetic field allowing to solidify.The solidification structure is observed by the optical microscope.The results show that the solidification structure of the alloy is evidently refined with rotating magnetic field.The structure is changed from columnar structure into near-equiaxed crystal or particle as flower,at the same time,the partial arm spacing is clearly reduced.The different effect on the solidification structure can be achieved with the different magnetic field strength and the magnetic field strength generated by the voltage of 100V is optimal,but the overtop or under magnetic field strength is the disadvantage for refining grains.