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Production of Al-Zr Master Alloy by Electrolysis of the KF-NaF-AlF3-ZrO2 Melt: Modifying Ability of the Master Alloy

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Abstract

In prior works, a novel method for continuously obtaining Al-Zr master alloys from oxide raw materials by electrolysis of a low-melting electrolyte based on the KF-NaF-AlF3-ZrO2 system at 800 °C to 820 °C was proposed. In the present work, the method for preparing the Al-Zr master alloy proceeded in an enlarged 100 A electrolyzer and the obtained master alloy was applied for grain refinement and improvement of its aluminum alloy properties. The modifying ability of the master alloy was studied, drawing on the example of the Al-Si-Fe alloy. Different amounts of the Al-Zr master alloy with a content of 10 wt pct zirconium were added to the Al-Si-Fe alloy at 900 °C. The effect of the zirconium content in the aluminum alloy and its cooling rate on its structure and properties was revealed. It was found that the addition of zirconium to the alloy refined the grain by 4 to 5 times without changing its shape or structure. A study of the joint effect of alloying and rate cooling indicated that a grain size reduction of up to 5 mkm can be achieved by these procedures.

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Acknowledgments

The authors are grateful to V.V. Astafyev (the leading engineer of the Institute of Metal Physics UB RAS) for the obtaining the AK6 ingots modified with Al-Zr master alloy.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry UB RAS, Yekaterinburg, Russia, 620137

    Aleksandr Filatov, Andrey Suzdaltsev & Yurii Zaikov

  2. Ural Federal University, Yekaterinburg, Russia, 620002

    Aleksandr Filatov, Andrey Suzdaltsev & Yurii Zaikov

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  1. Aleksandr Filatov
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  2. Andrey Suzdaltsev
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  3. Yurii Zaikov
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Correspondence to Andrey Suzdaltsev.

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Manuscript submitted 7 June 2021; accepted 25 September 2021.

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Filatov, A., Suzdaltsev, A. & Zaikov, Y. Production of Al-Zr Master Alloy by Electrolysis of the KF-NaF-AlF3-ZrO2 Melt: Modifying Ability of the Master Alloy. Metall Mater Trans B 52, 4206–4214 (2021). https://doi.org/10.1007/s11663-021-02340-1

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