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Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation

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Abstract

The strain-rate sensitivity of the flow stress represents a crucial parameter for characterizing the deformation kinetics of a material. In this work a new method was developed and validated for determining the local strain-rate sensitivity of the flow stress at different plastic strains. The approach is based on spherical nanoindentation strain-rate jump tests during one deformation experiment. In the case of ultrafine-grained Al and ultrafine-grained Cu good agreement between this technique and macroscopic compression tests has been achieved. In contrast to this, individual spherical nanoindentation experiments at constant strain-rates resulted in unrealistically high strain-rate sensitivities for both materials because of drift influences. Microstructural investigations of the residual spherical imprints on ultrafine-grained Al and ultrafine-grained Cu revealed significant differences regarding the deformation structure. For ultrafine-grained Cu considerably less activity of grain boundary sliding has been observed compared to ultrafine-grained Al.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge the funding of the German Research Council (DFG) which, within the framework of its “Excellence Initiative”, supports the cluster of excellence “Engineering of Advanced Materials” at the University of Erlangen-Nuremberg.

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Authors and Affiliations

  1. Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058, Erlangen, Germany

    Patrick Feldner, Benoit Merle & Mathias Göken

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  1. Patrick Feldner
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  2. Benoit Merle
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  3. Mathias Göken
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Correspondence to Patrick Feldner.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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Feldner, P., Merle, B. & Göken, M. Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation. Journal of Materials Research 32, 1466–1473 (2017). https://doi.org/10.1557/jmr.2017.69

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  • DOI: https://doi.org/10.1557/jmr.2017.69

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