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Determination of the internal stress and dislocation velocity stress exponent with indentation stress relaxation test

Published online by Cambridge University Press:  31 January 2011

B.X. Xu ,
X.M. Wang  and
Z.F. Yue
B.X. Xu*
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwest Polytechnical University, Xi’an 710072, People’s Republic of China
X.M. Wang
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwest Polytechnical University, Xi’an 710072, People’s Republic of China
Z.F. Yue
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwest Polytechnical University, Xi’an 710072, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Indentation stress relaxation tests were carried out on high-purity polycrystalline copper specimens at room temperature with a flat cylindrical indenter. The experimental results showed that the resulting load-time relaxation curves can be described by a power law, which coupled an internal stress and an integral constant between the effective stress and relaxation time. Then the internal stress, integral constant, and dislocation velocity stress exponent can be extracted from load relaxation curves. The derived values from this way were consistent with the results of conventional uniaxial compression stress relaxation tests. These agreements are not only useful to understand deformation (dislocation) mechanisms under the indenter, but also exhibit an attractive potential of measuring nano/micromechanical properties of materials by indentation test.

Keywords

DislocationsMetal
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 9 , September 2008 , pp. 2486 - 2490
Copyright
Copyright © Materials Research Society 2008

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