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Size effect measurement and characterization in nanoindentation test

Published online by Cambridge University Press:  03 March 2011

Yueguang Wei ,
Xuezheng Wang  and
Manhong Zhao
Yueguang Wei*
Affiliation:
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
Xuezheng Wang
Affiliation:
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
Manhong Zhao
Affiliation:
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
*
a)Address all correspondence to this author.e-mail: ywei@Lnm.imech.ac.cn
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Abstract

Nanoindentation test at scale of hundreds of nanometers has shown that measured hardness increases strongly with decreasing indent depth, which is frequently referred to as the size effect. Usually, the size effect is displayed in the hardness-depth curves. In this study, the size effect is characterized in both the load–displacement curves and the hardness–depth curves. The experimental measurements were performed for single-crystal copper specimen and for surface-nanocrystallized Al-alloy specimen. Moreover, the size effect was characterized using the dislocation density theory. To investigate effects of some environmental factors, such as the effect of surface roughness and the effect of indenter tip curvature, the specimen surface profile and the indentation imprint profile for single-crystal copper specimen were scanned and measured using the atomic force microscopy technique. Furthermore, the size effect was characterized and analyzed when the effect of the specimen surface roughness was considered.

Keywords

NanoindentationHardnessDislocations
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 208 - 217
Copyright
Copyright © Materials Research Society 2004

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