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A Formation Map of Iron-Containing Intermetallic Phases in Recycled Cast Aluminum Alloys

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Abstract

The cooling rate-dependent modification effect of Mn on the formation of Fe-containing intermetallic phases during solidification of Al-Si-Mg secondary cast aluminum alloys [containing 0.5 to 1 pct Fe (All compositions are in wt pct unless otherwise stated.)] was investigated by CALculation of PHAse Diagrams (CALPHAD) modeling and solidification experiments. The critical Mn concentration required to prevent the formation of detrimental β-Al5FeSi was found to be dependent on both the alloy composition (particularly the Fe/Mn ratio) and the cooling rate. A map of Fe/Mn ratio vs cooling rate was created, to summarize the metallurgical conditions of Fe-rich intermetallic phase formation. By understanding such formation conditions, the microstructure of aluminum castings can be controlled to create low-cost secondary alloys with high Fe content.

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Acknowledgments

The authors would like to acknowledge the National Science Foundation for supporting this work (Award CMMI-1432688). Dr. Yeou-Li Chu and Mr. Patrick Cheng of Ryobi Die Casting are also acknowledged for helpful discussions.

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Authors and Affiliations

  1. Department of Materials Science & Engineering, The Ohio State University, Columbus, OH, 43210, USA

    E. Cinkilic, C. D. Ridgeway & A. A. Luo

  2. Alcoa Technical Center, New Kensington, PA, 15068, USA

    X. Yan

  3. Department of Integrated Systems Engineering, The Ohio State University, Columbus, OH, 43210, USA

    A. A. Luo

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  1. E. Cinkilic
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  2. C. D. Ridgeway
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  3. X. Yan
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  4. A. A. Luo
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Correspondence to A. A. Luo.

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Manuscript submitted June 21, 2019.

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Cinkilic, E., Ridgeway, C.D., Yan, X. et al. A Formation Map of Iron-Containing Intermetallic Phases in Recycled Cast Aluminum Alloys. Metall Mater Trans A 50, 5945–5956 (2019). https://doi.org/10.1007/s11661-019-05469-6

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