王永飞,赵升吨,樊晓光,李双江,蒋红,王军.电磁搅拌法制备铝合金半固态坯料的研究[J].稀有金属材料与工程,2020,49(10):3569~3575.[Wang Yongfei,Zhao Shengdun,Fan Xiaoguang,Li Shuangjiang,Jiang Hong,Wang Jun.Study on the Aluminum Alloy Semi-Solid Billets Prepared by Electromagnetic Stirring Process[J].Rare Metal Materials and Engineering,2020,49(10):3569~3575.]
电磁搅拌法制备铝合金半固态坯料的研究
投稿时间:2019-11-04  修订日期:2019-11-17
中文关键词:  铝合金  半固态坯料  电磁搅拌  微观组织
基金项目:中央高校基本科研业务费专项资金资助(项目号XZY012019003/XZD012019009);西北工业大学凝固技术国家重点实验室开放课题资助(项目号SKLSP201921);中国博士后科学基金资助(项目号2018M643627)。
中文摘要:
      分别研究了搅拌电流及搅拌频率对2A50铝合金半固态坯料中心及边缘位置微观组织的影响规律。结果表明:无搅拌电流及搅拌频率时,坯料的微观组织主要由粗大的树枝晶组成,部分枝晶臂长度甚至超过200 μm,不能用于半固态成形。随着搅拌电流或搅拌频率的增加,中心与边缘位置的平均晶粒尺寸均不断减小并在搅拌电流超过30A或搅拌频率超过30Hz时略有增加;中心与边缘位置的形状因子都不断增加并逐渐趋于平缓,但当搅拌电流为40A或搅拌频率为40Hz时略有下降;同时,中心与边缘位置微观组织的均匀性越来越好。在搅拌电流30A、搅拌频率30Hz条件下,能够制备出平均晶粒尺寸和形状因子分别为75.6 μm及0.73的具有理想微观组织的半固态坯料。
Study on the Aluminum Alloy Semi-Solid Billets Prepared by Electromagnetic Stirring Process
英文关键词:aluminum alloy  semi-solid billet  electromagnetic stirring  microstructure
英文摘要:
      The effects of the stirring current and frequency on the microstructure of the semi-solid 2A50 alloy at the central and peripheral parts of the billet were studied. Results showed that the coarse dendritic particles were the main constituent of the microstructure without electromagnetic stirring, where the length of the dendrite arm was larger than 200 μm. This type of semi-solid billet was unqualified for the semi-solid forming. With the increase in stirring current or stirring frequency, the average size of the grains located at the central and peripheral regions decreased first and then slightly increased when the stirring current and stirring frequency is over 30A and 30Hz, respecitvely; the shape factors at centeral and center parts gradually increased and then slightly decreased when the stirring current is 40A or the stirring frequency is 40 Hz; Furthermore, the uniformity of the grain size and shape at the central and peripheral parts was improved with the increase in the stirring current or the frequency. The optimal average grain size and the shape factor were able to be obtained as 75.6 μm and 0.73, respectively under the stirring current of 30A and stirring frequency of 30Hz.
作者单位E-mail
王永飞 西安交通大学 yongfeio@126.com 
赵升吨 西安交通大学 sdzhao@xjtu.edu.cn 
樊晓光 西北工业大学  
李双江 西安交通大学  
蒋红 西安交通大学  
王军 中国重型机械研究院股份公司  
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