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Influence of the ECAP Processing Parameters on the Cyclic Deformation Behavior on Ultrafine-Grained Cubic Face Centered Metals

Authors

  • Andreas Böhner,

    Corresponding author
    1. Department of Materials Science and Engineering – Institute 1, University of Erlangen-Nuernberg, Martensstr. 5, 91058 Erlangen, Germany
    • Department of Materials Science and Engineering – Institute 1, University of Erlangen-Nuernberg, Martensstr. 5, 91058 Erlangen, Germany.
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  • Heinz Werner Höppel,

    1. Department of Materials Science and Engineering – Institute 1, University of Erlangen-Nuernberg, Martensstr. 5, 91058 Erlangen, Germany
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  • Johannes May,

    1. Department of Materials Science and Engineering – Institute 1, University of Erlangen-Nuernberg, Martensstr. 5, 91058 Erlangen, Germany
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  • Mathias Göken

    1. Department of Materials Science and Engineering – Institute 1, University of Erlangen-Nuernberg, Martensstr. 5, 91058 Erlangen, Germany
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  • The authors would like to thank the Deutsche Forschungsgemeinschaft (DFG) for funding this project within the Forschergruppe FOR 544. The able support of Xenia Molodova for performing the texture measurements via EBSD at the RWTH Aachen at the Institute of Prof. G. Gottstein is gratefully acknowledged.

Abstract

Ultrafine-grained (UFG) materials are widely known to exhibit significantly improved fatigue properties when the fatigue life is regarded in a Wöhler-SN-plot. More detailed, the achieved improvements in fatigue life significantly depend on the processing conditions of these UFG materials. In this work the influence of several equal channel angular pressing (ECAP) processing parameters on the fatigue properties of the Al–Mg model system with up to 2% of magnesium and on the technical alloy AA5754, namely AlMg3 are investigated. Most surprisingly, it is found that the material produced with route A (no rotation between ECAP passes), exhibit a higher fatigue life than the material produced by route Bc (90°-rotation between ECAP passes). It is found that the different textures are responsible for that behavior. Moreover, the number of ECAP passes or the application of backpressure also significantly influences the fatigue life. In this context, relevant differences in the cyclic deformation behavior, microstructure, and damage mechanisms were discussed in this paper.

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