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Surface roughness effects on the displacement bursts observed in nanoindentation

Published online by Cambridge University Press:  03 March 2011

Yoji Shibutani  and
Atsuhiro Koyama
Yoji Shibutani*
Affiliation:
Department of Mechanical Engineering and Systems, Handai Frontier Research Center, Osaka University, Osaka 565-0871, Japan
Atsuhiro Koyama
Affiliation:
Department of Mechanical Engineering and Systems, Handai Frontier Research Center, Osaka University, Osaka 565-0871, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The distinctive finding of unstable displacement bursts of indent depth observed in nanoindentation is thought to be linked to the dislocation emission phenomenon. However, because of a lack of understanding of the surface physics of the contact area, the explanation of the instability mechanism remains vague. In this paper, an effect of the surface roughness on the displacement bursts was experimentally investigated using single-crystalline aluminum. The surface properties of samples with several degrees of roughness of less than 10 nm were measured using atomic force microscopy. The discussion focuses on the relations between critical values of the load at the displacement bursts and the burst width.

Keywords

NanoindentationDislocationsCrystal
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 183 - 188
Copyright
Copyright © Materials Research Society 2004

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References

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