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Mechanical properties and corrosion behaviour of ultrafine-grained AA6082 produced by equal-channel angular pressing

  • Ultrafine-Grained Materials
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Abstract

The mechanical properties and corrosion behaviour of AA6082 with ultrafine-grained (UFG) microstructure were investigated. The material was processed by equal-channel angular pressing (ECAP) up to eight extrusions at room temperature in a 90°-die with active backpressure. Besides the peak-aged temper, which provides maximum strengths and strongly reduced ductility, the solution heat treated condition was considered as well. Combined with post-ECAP aging, an optimum of high strength, ductility and impact toughness was achieved. The corrosion investigations and the examination of the corrosion damage of the UFG-materials show higher pitting corrosion resistance compared to the unprocessed material. The optimised condition was used for the production of screw prototypes which showed appreciable higher strength and ductility compared to the identically manufactured screws from the CG counterpart. Such materials are potential candidates to be used for several engineering applications such as high strength screws even at higher temperatures.

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Acknowledgements

The authors gratefully acknowledge the Deutsche Forschungsgemeinschaft (DFG) for supporting this work carried out within the framework of Sonderforschungsbereich 692 (Collaborative Research Center; A2, B2). The authors would like to thank Dr. Harry Podlesak for performing the STEM investigations.

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Authors and Affiliations

  1. Institute for Materials and Impact Engineering, Chemnitz University of Technology, Erfenschlager Str. 73, 09125, Chemnitz, Germany

    Matthias Hockauf & Lothar W. Meyer

  2. Institute for Composite Materials and Surface Technology, Chemnitz University of Technology, Erfenschlager Str. 73, 09125, Chemnitz, Germany

    Daniela Nickel, Gert Alisch, Thomas Lampke & Bernhard Wielage

  3. TU Bergakademie Freiberg, Institute for Materials Engineering, Gustav-Zeuner Straße 5, 09596, Freiberg, Germany

    Lutz Krüger

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  1. Matthias Hockauf
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  2. Lothar W. Meyer
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  4. Gert Alisch
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  7. Lutz Krüger
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Correspondence to Matthias Hockauf.

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Hockauf, M., Meyer, L.W., Nickel, D. et al. Mechanical properties and corrosion behaviour of ultrafine-grained AA6082 produced by equal-channel angular pressing. J Mater Sci 43, 7409–7417 (2008). https://doi.org/10.1007/s10853-008-2724-9

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  • DOI: https://doi.org/10.1007/s10853-008-2724-9

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