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Deformation behavior of spray-formed hypereutectic Al–Si alloys

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Abstract

The deformation behavior of spray-formed hypereutectic aluminum–silicon alloys—AlSix (x = 18, 25, and 35 wt%)—has been studied by means of compression test at various temperatures and strain rates. The flow stress of the spray-formed Al–Si alloys increases with decreasing compression temperature and increasing strain rate. Higher silicon content in the alloys also leads to higher flow stress during deformation. The flow curves determined from the compression tests exhibit that the deformation of the materials is controlled by two competing mechanisms: strain hardening, and flow softening. Particle damage during the deformation may have an influence on the flow curves of the alloys with large silicon particles. Based on the flow curves obtained from the compression tests and knowledge of aluminum extrusion, the spray-formed hypereutectic Al–Si alloy billets have been hot extruded into wires with a high area reduction ratio around 189. Since primary silicon particles were greatly refined and uniformly distributed in the spray-formed materials, the heavy deformations of the spray-formed Al–Si alloys containing high amount of silicon were successfully performed.

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Acknowledgements

The authors gratefully acknowledge the financial support of the German Federal Ministry of Economics and Technology via the Federation of Industrial Research Associations (Arbeitsgemeinschaft industrieller Forschungsvereinigungen “Otto von Guericke” e.V.; AiF) within the program AiF-191ZN at the Foundation Institute for Materials Science (IWT) in Bremen. We also would like to thank our project partners for their beneficial contributions and valuable discussions on this study.

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  1. Foundation Institute of Materials Science, Badgasteiner Str. 3, 28359, Bremen, Germany

    C. Cui, A. Schulz, J. Epp & H. W. Zoch

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  1. C. Cui
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  2. A. Schulz
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  3. J. Epp
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  4. H. W. Zoch
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Correspondence to C. Cui.

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Cui, C., Schulz, A., Epp, J. et al. Deformation behavior of spray-formed hypereutectic Al–Si alloys. J Mater Sci 45, 2798–2807 (2010). https://doi.org/10.1007/s10853-010-4269-y

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  • DOI: https://doi.org/10.1007/s10853-010-4269-y

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