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Nanoindentation strain-rate jump tests for determining the local strain-rate sensitivity in nanocrystalline Ni and ultrafine-grained Al

Published online by Cambridge University Press:  02 June 2011

Verena Maier ,
Karsten Durst ,
Johannes Mueller ,
Björn Backes ,
Heinz Werner Höppel  and
Mathias Göken
Verena Maier
Affiliation:
Department of Materials Science and Engineering, Institute 1: General Materials Properties, University Erlangen-Nuremberg, 91058 Erlangen, Germany
Karsten Durst*
Affiliation:
Department of Materials Science and Engineering, Institute 1: General Materials Properties, University Erlangen-Nuremberg, 91058 Erlangen, Germany
Johannes Mueller
Affiliation:
Department of Materials Science and Engineering, Institute 1: General Materials Properties, University Erlangen-Nuremberg, 91058 Erlangen, Germany
Björn Backes
Affiliation:
Department of Materials Science and Engineering, Institute 1: General Materials Properties, University Erlangen-Nuremberg, 91058 Erlangen, Germany
Heinz Werner Höppel
Affiliation:
Department of Materials Science and Engineering, Institute 1: General Materials Properties, University Erlangen-Nuremberg, 91058 Erlangen, Germany
Mathias Göken
Affiliation:
Department of Materials Science and Engineering, Institute 1: General Materials Properties, University Erlangen-Nuremberg, 91058 Erlangen, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A nanoindentation strain-rate jump technique has been developed for determining the local strain-rate sensitivity (SRS) of nanocrystalline and ultrafine-grained (UFG) materials. The results of the new method are compared to conventional constant strain-rate nanoindentation experiments, macroscopic compression tests, and finite element modeling (FEM) simulations. The FEM simulations showed that nanoindentation tests should yield a similar SRS as uniaxial testing and generally a good agreement is found between nanoindentation strain-rate jump experiments and compression tests. However, a higher SRS is found in constant indentation strain-rate tests, which could be caused by the long indentation times required for tests at low indentation strain rates. The nanoindentation strain-rate jump technique thus offers the possibility to use single indentations for determining the SRS at low strain rates with strongly reduced testing times. For UFG-Al, extremely fine-grained regions around a bond layer exhibit a substantial higher SRS than bulk material.

Keywords

NanoindentationHardnessSimulation
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 11 , 14 June 2011 , pp. 1421 - 1430
Copyright
Copyright © Materials Research Society 2011

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