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Effects of NaBF4 + NaF on the Tensile and Impact Properties of Al-Si-Mg-Fe Alloys

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Abstract

NaBF4 + NaF were found to play three roles, i.e., Fe-eliminator, grain refiner, and eutectic modifier, in treating A356 alloy with a high Fe content. The joint effects led to significant improvement in both tensile and impact properties of thus treated alloy. The multiple reactions between the NaBF4 + NaF and Al-Si-Mg-Fe system are suggested to form Fe2B, AlB2, and Na in the melt, as per thermodynamic analysis. The three are responsible for Fe removal, grain refinement, and eutectic modification, respectively. When NaBF4 and NaF are mixed in weight ratio of 1:1, an optimum addition rate is in the range between 1.0 and 2.0 wt pct for treating AlSi7Mg0.3Fe0.65 alloy, based on the results of tensile and impact tests. Excessive addition of the salt may deteriorate the mechanical properties of the alloy, basically owing to overmodification of Si and contamination of salt inclusions.

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Acknowledgments

The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (Nos. 51274054, U1332115, 51271042, 51375070), the Keygrant Project of Chinese Ministry of Education (No. 313011), the Science and Technology Planning Project of Dalian (No. 2013A16GX110), the China Postdoctoral Science Foundation, and the Fundamental Research Funds for the Central Universities. In-depth comments and valuable suggestions from the reviewers are appreciated.

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Authors and Affiliations

  1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian, 116024, Liaoning, P.R. China

    Zongning Chen (Student), Tongmin Wang (Professor), Yufei Zhao (Student) & Yuanping Zheng (Student)

  2. Laboratory of Special Processing of Raw Materials, Dalian University of Technology, Dalian, 116024, P.R. China

    Zongning Chen (Student) & Huijun Kang (Lecturer)

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  1. Zongning Chen
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  2. Tongmin Wang
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  3. Yufei Zhao
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  4. Yuanping Zheng
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  5. Huijun Kang
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Corresponding author

Correspondence to Tongmin Wang.

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Manuscript submitted September 23, 2014.

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Chen, Z., Wang, T., Zhao, Y. et al. Effects of NaBF4 + NaF on the Tensile and Impact Properties of Al-Si-Mg-Fe Alloys. Metall Mater Trans A 46, 2063–2072 (2015). https://doi.org/10.1007/s11661-015-2759-x

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