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Effect of a high magnetic field on the morphological and crystallographic features of primary Al6Mn phase formed during solidification process

Published online by Cambridge University Press:  11 June 2013

Lei Li ,
Zhihao Zhao ,
Yubo Zuo ,
Qingfeng Zhu  and
Jianzhong Cui
Lei Li*
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China
Zhihao Zhao
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China
Yubo Zuo
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China
Qingfeng Zhu
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China
Jianzhong Cui
Affiliation:
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Morphological and crystallographic effects of a high magnetic field on the primary Al6Mn phase formed during the solidification of hypereutectic Al–3.25wt%Mn were investigated. Without the field, the primary Al6Mn crystals are mainly concentrated in the lower part and reveal a dispersed needle-like shape. In three dimension, the needles are in the form of a quadrangular prism (laterally bound by {110} and preferentially growing along <001>). When the magnetic field is applied, they tend to be distributed homogenously and show some extra agglomerate- or chain-like forms (preferentially extending along <100>). Furthermore, they also tend to preferentially orient with <100> parallel to the field direction. The homogenous distribution is caused by the magnetic viscosity resistance force. The “agglomerates” or “chains” are the result of a “bifurcation effect” due to the breakdown at the sharp edges of the quadrangular prisms. The preferential orientation should be attributed to the magnetocrystalline anisotropy of Al6Mn.

Keywords

crystal growthmorphologymagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 12 , 28 June 2013 , pp. 1567 - 1573
Copyright
Copyright © Materials Research Society 2013 

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