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

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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.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51201029), the China Postdoctoral Science Foundation (Grant No. 2012M520637), and National Basic Research Program of China (Grant No. 2012CB619506).

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Authors and Affiliations

  1. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China

    Lei Li, Zhihao Zhao, Yubo Zuo, Qingfeng Zhu & Jianzhong Cui

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  1. Lei Li
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  2. Zhihao Zhao
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  3. Yubo Zuo
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Correspondence to Lei Li.

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Li, L., Zhao, Z., Zuo, Y. et al. Effect of a high magnetic field on the morphological and crystallographic features of primary Al6Mn phase formed during solidification process. Journal of Materials Research 28, 1567–1573 (2013). https://doi.org/10.1557/jmr.2013.155

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  • DOI: https://doi.org/10.1557/jmr.2013.155

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