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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(英文),2020,49(10):3569~3575.[Wang Yongfei,Zhao Shengdun,Fan Xiaoguang,Li Shuangjiang,Jiang Hong and 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.]
Study on the Aluminum Alloy Semi-Solid Billets Prepared by Electromagnetic Stirring Process
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Received:November 04, 2019  Revised:November 17, 2019
DOI:
Key words: aluminum alloy  semi-solid billet  electromagnetic stirring  microstructure
Foundation item: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)。
Author NameAffiliation
Wang Yongfei,Zhao Shengdun,Fan Xiaoguang,Li Shuangjiang,Jiang Hong and Wang Jun  
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Abstract:
      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.