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Near-Surface Microstructure on Twin-Roll Cast 8906 Aluminum Alloy

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Abstract

The microstructure of the near-surface region of twin-roll cast foil stock 8906 AlFeSi alloy has been investigated. It was revealed that a near-surface layer with microstructure differing from that of the underlying bulk alloy was generated due to severe surface shear strain during twin-roll casting. Scanning and transmission electron microscopy showed that the near-surface layer consists of nano-sized grains with diameters varying in the range of 50 to 600 nm. Energy dispersive X-ray spectroscopy revealed that grain boundaries within the near-surface layer were decorated by aluminum oxide particles and carbon-containing lubricant inclusions. Preferential precipitation of a high population density of cubic α-AlFeSi dispersoids, of 30 to 150 nm diameter, was observed within the near-surface layer. The near-surface layer was associated with shingles on the twin-roll cast alloy surface and the maximum layer thickness of approximately 6 µm was observed at the shingles. Other areas of the surface were either free of the near-surface layer or had a thinner near-surface layer.

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Acknowledgments

The authors wish to thank the UK Engineering and Physical Sciences Research Council for support of the LATEST2 Programme Grant. China Scholarship Council and Novelis are also thanked for provision of financial support.

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Authors and Affiliations

  1. School of Materials, The University of Manchester, Manchester, M13 9PL, UK

    Junjie Wang, Xiaorong Zhou & George E. Thompson

  2. Novelis Global Research and Technology Center, Kennesaw, GA, 30144, USA

    John A. Hunter & Yudie Yuan

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  1. Junjie Wang
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  2. Xiaorong Zhou
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  3. George E. Thompson
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  5. Yudie Yuan
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Correspondence to Xiaorong Zhou.

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Manuscript submitted July 25, 2014.

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Wang, J., Zhou, X., Thompson, G.E. et al. Near-Surface Microstructure on Twin-Roll Cast 8906 Aluminum Alloy. Metall Mater Trans A 46, 2688–2695 (2015). https://doi.org/10.1007/s11661-015-2877-5

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