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The effect of grain size on the mechanical properties of nanonickel examined by nanoindentation

  • Bo Yang EMAIL logo and Horst Vehoff
Published/Copyright: February 14, 2022
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Abstract

Nanocrystalline nickel produced by pulsed electrolysis was heat-treated to produce grain sizes from nanoscale to microscale. A special polish allowed to image the specimen with an atomic force microscope (AFM) down to a grain size of 30 nm. Micro- and instrumented nanohardness of these specimens were examined. A NI-AFM (Nanoindenting AFM) was used to measure the interaction between grain boundaries and dislocations. Nanoindentation was performed always in the center of the grains. When the size of the indent was kept constant (constant strain) it could be shown that the hardness scales with the dislocation density within the grains. However, when the size of the indent approached the grain size, the plastic zone spread over several grains and a decrease in hardness was observed. In addition, with deceasing grain size, grain boundary sliding was observed even at room temperature.


Dedicated to Professor Dr. Peter Neumann on the occasion of his 65th birthday

Dipl.-Ing. Bo Yang Universität des Saarlandes Grundlagen der Werkstoffwissenschaften und Methodik (WWM) Postfach 15 11 50 D-66041 Saarbrücken, Germany Tel.: +49 681 302 5043 Fax: +49 681 302 5015

  1. The support of this work under the contract number SFB 277 (B8) is gratefully acknowledged. One author (Bo Yang) is grateful to Prof. Mathias Göken, University Erlangen-Nürnberg, for his advice and help, and to Prof. Hempelmann (Physical Chemistry, SFB 277), for the nano-nickel.

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Received: 2004-01-14
Accepted: 2004-02-21
Published Online: 2022-02-14
Published in Print: 2022-02-14

© 2004 Carl Hanser Verlag, München

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