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Getting accurate nanoindentation data from time-dependent and microstructural effects of zinc

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Published/Copyright: May 23, 2013

Abstract

The main objective of this study was obtaining accurate data from nanoindentation experiments on zinc. Nanoindentation experiments can be performed under displacement control, load control, or open loop conditions at different loading/unloading rates. All the above control schemes and range of loading rates were used to test pure zinc samples with different surface preparation using a Hysitron Triboindenter fitted with a blunt Berkovich indenter. The results showed that displacement control with a high loading/unloading rate gave the most reliable results. However, because of the anisotropy of zinc and its large grain size the material should be considered as a single crystal on the scale of the impression generated. It has been found that using the feedback control of nanoindentation experiments can give a significant improvement in the results compared to open loop control due to the time-dependent behaviour of zinc. A full factorial design of experiments approach was performed to investigate the optimum combination of the feedback parameters to obtain accurate and reliable data for the hardness and Young's modulus of zinc.


* Correspondence address, Reza Rastegar Tohid, School of Chemical Engineering and Advanced Materials, Herschel Building, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, UK, Tel.: +44 191 222 3635, Fax: +44 191 222 8563, E-mail:

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Received: 2006-10-11
Accepted: 2007-1-14
Published Online: 2013-05-23
Published in Print: 2007-05-01

© 2007, Carl Hanser Verlag, München

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