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

Published online by Cambridge University Press:  06 March 2017

Patrick Feldner Open the ORCID record for Patrick Feldner [Opens in a new window] ,
Benoit Merle  and
Mathias Göken
Patrick Feldner*
Affiliation:
Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058 Erlangen, Germany
Benoit Merle
Affiliation:
Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058 Erlangen, Germany
Mathias Göken
Affiliation:
Materials Science & Engineering, Friedrich-Alexander-University Erlangen-Nuremberg (FAU), Institute I, D-91058 Erlangen, Germany
*
a) Address all correspondence to this author. e-mail: patrick.feldner@fau.de
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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.

Keywords

nanoindentationspherical indentationstrain-rate sensitivityultrafine-grained material
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 8 , 28 April 2017 , pp. 1466 - 1473
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: George M. Pharr

b)

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/.

A previous error in this article has been corrected, see 10.1557/jmr.2017.245.

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