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Journal of Materials Research Journal of Materials Research

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Structural and crystallographic study on 3004 aluminum alloy ingot by horizontal direct chill casting under combined electromagnetic fields

Published online by Cambridge University Press:  20 February 2015

Lei Li ,
Qingfeng Zhu ,
Zhihao Zhao ,
Haitao Zhang ,
Yubo Zuo  and
Jianzhong Cui
Lei Li
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China
Qingfeng Zhu
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China
Zhihao Zhao
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China
Haitao Zhang
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China
Yubo Zuo
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China
Jianzhong Cui
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People's Republic of China
Corresponding
E-mail address:
lilei@epm.neu.edu.cn
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Abstract

Effect of combined electromagnetic fields (EMFs) on the structures of a 3004 aluminum alloy ingot produced by horizontal direct chill casting was crystallographically investigated. The results showed that the structure was transformed from a mixture of equiaxed and fine columnar grains to coarse columnar grains with switching off the EMFs. With the EMFs the grain size is small and shows a uniform distribution, whereas without the EMFs it is increased and reveals inhomogeneous distribution on the cross section. Besides, a transition region composed of fine equiaxed grains appeared at the moment the EMFs were switched off (between the mixture and coarse columnar grains). Furthermore, the microstructure transformation is accompanied by a crystallographic orientation change from a preferred <100> orientation to a random orientation, and then to an intense <100> fiber texture. The structural and crystallographic transformations are mainly related to the forced convection in the melt due to the induced Lorentz force by the EMFs.

Keywords

Al casting microstructure
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 5 , 14 March 2015 , pp. 745 - 752
Copyright
Copyright © Materials Research Society 2015 

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