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Effects of Internal Electromagnetic Stirring on the Microstructure Refinement and Composition Homogenization of Large-Scale 7075 Aluminum Alloy Billet

  • Advanced Casting and Melt Processing Technology for Light Alloys
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Abstract

An innovative melt treatment method known as internal electromagnetic stirring is proposed and used in direct chill casting to refine the microstructure and homogenize the composition of a large-scale 7075 aluminum alloy billet. The effects of internal electromagnetic stirring on the billet are investigated. The results show that the internal electromagnetic stirring significantly refines the microstructure and decreases macrosegregation compared with conventional direction chill casting. The average grain size is decreased to 211–219 μm, and the largest relative positive and negative macrosegregation rates of Zn, Mg, and Cu are decreased to 2.44% and 2.11%, 1.56% and 1.32%, and 2.64% and 1.98%, respectively. The internal electromagnetic stirring refines the microstructure by increasing the number of nuclei, creating a relatively low and homogeneous temperature field, and decreasing the sump depth. Furthermore, the internal electromagnetic stirring decreases the macrosegregation by inhibiting the thermo-solutal convection, strengthening the equivalent shrinkage-induced flow, and decreasing the permeability.

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Acknowledgement

This work was supported by the Topmost Research Institution Construction Project of Guangdong Academy of Sciences (Grant Numbers 2021GDASYL-20210103107).

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Authors and Affiliations

  1. Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510630, China

    Yang Qiu

  2. Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou, 510630, China

    Yang Qiu

  3. General Research Institute for Nonferrous Metals, Beijing, 100888, China

    Zhifeng Zhang

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  1. Yang Qiu
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  2. Zhifeng Zhang
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Correspondence to Yang Qiu.

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Qiu, Y., Zhang, Z. Effects of Internal Electromagnetic Stirring on the Microstructure Refinement and Composition Homogenization of Large-Scale 7075 Aluminum Alloy Billet. JOM 73, 3812–3818 (2021). https://doi.org/10.1007/s11837-021-04875-9

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  • DOI: https://doi.org/10.1007/s11837-021-04875-9

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