The influence of indenter tip rounding on the indentation size effect
The influence of indenter tip rounding on the indentation size effect
A model was developed to interpret the indentation size effect. The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, preexisting statistically stored dislocations and grain size. It is shown that the shape of the worn tip can be effectively determined through calibration experiments. The model is applied to predict dislocation densities, and shows a good correspondence with published data on dislocation densities in copper single crystals. Predicted ISE is shown to be in good correspondence with published data on a range of metals, and an improvement over existing models is demonstrated.
ultra fine-grained (ufg) aluminium, nanoindentation, geometrically
necessary dislocations, tip rounding effect, hardness, ssd, gnd, rounded indenter
3690-3700
Qiao, Xiaoguang
7fa1ecc9-febc-4ee6-9eb1-1d21a0e31741
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
June 2010
Qiao, Xiaoguang
7fa1ecc9-febc-4ee6-9eb1-1d21a0e31741
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Qiao, Xiaoguang, Starink, Marco J. and Gao, Nong
(2010)
The influence of indenter tip rounding on the indentation size effect.
Acta Materialia, 58 (10), .
(doi:10.1016/j.actamat.2010.03.004).
Abstract
A model was developed to interpret the indentation size effect. The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, preexisting statistically stored dislocations and grain size. It is shown that the shape of the worn tip can be effectively determined through calibration experiments. The model is applied to predict dislocation densities, and shows a good correspondence with published data on dislocation densities in copper single crystals. Predicted ISE is shown to be in good correspondence with published data on a range of metals, and an improvement over existing models is demonstrated.
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Published date: June 2010
Keywords:
ultra fine-grained (ufg) aluminium, nanoindentation, geometrically
necessary dislocations, tip rounding effect, hardness, ssd, gnd, rounded indenter
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 69745
URI: http://eprints.soton.ac.uk/id/eprint/69745
ISSN: 1359-6454
PURE UUID: d4884351-73c9-4a25-8ba2-a35d7422aa1c
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Date deposited: 02 Dec 2009
Last modified: 14 Mar 2024 02:45
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Author:
Xiaoguang Qiao
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