Home Technology Effects of grain growth on microhardness and coercivity in electrodeposited nanocrystalline nickel
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Effects of grain growth on microhardness and coercivity in electrodeposited nanocrystalline nickel

  • Gabriele Vidrich , Aneta Flejszar , Agnieszka Mielczarek and Werner Riehemann
Published/Copyright: June 11, 2013

Abstract

Nickel specimens with various grain sizes were produced by electrochemical deposition. As-deposited pure nickel had a mean grain size of 300 nm. By dispersing nanoscaled SiO2- and Al2O3-particles in the electrolyte it was possible to reduce the grain size by incorporation of these particles into the growing nickel matrix. The grain sizes were 150 nm and 60 nm for the Al2O3- and SiO2-reinforced nanocomposite, respectively. Microhardness and coercivity of all samples were measured immediately after electrodeposition and after successive isochronal heat treatments with increasing annealing temperature. Grain growth of the samples could be observed by a decrease in hardness as well as coercivity with increasing annealing temperature.


* Correspondence address, Gabriele Vidrich Clausthal University of Technology Institute of Materials Science and Engineering Agricolastraße 6, D-38678 Clausthal-Zellerfeld Tel.: +49 5323 72 24 62 Fax: +49 5323 72 31 48 E-mail:

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Received: 2008-8-28
Accepted: 2009-2-16
Published Online: 2013-06-11
Published in Print: 2009-06-01

© 2009, Carl Hanser Verlag, München

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