期刊
ACTA MATERIALIA
卷 58, 期 10, 页码 3690-3700出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.03.004
关键词
Ultrafine-grained (UFG) aluminium; Nanoindentation; Geometrically necessary dislocations; Tip rounding effect
资金
- Engineering and Physical Sciences Research Council [EP/D00313X/1]
- School of Engineering Sciences of the University of Southampton
A model was developed to interpret the indentation size effect (ISE). The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, pre-existing 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. The 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. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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