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Microindentation of titanium: Dependence of plastic energy on the indentation depth and time-dependent plastic deformation

Published online by Cambridge University Press:  31 January 2011

Rong Chen ,
Fuqian Yang ,
M. Ashraf Imam ,
C.R. Feng  and
Peter Pao
Rong Chen
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
Fuqian Yang*
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
M. Ashraf Imam
Affiliation:
Material Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
C.R. Feng
Affiliation:
Material Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
Peter Pao
Affiliation:
Material Science and Technology Division, Naval Research Laboratory, Washington, DC 20375
*
a)Address all correspondence to this author.e-mail: [email protected]
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Abstract

The cavity model and the dislocation mechanics were used to analyze the plastic energy dissipated in an indentation deformation. The plastic energy dissipated in an indentation cycle was proportional to the cube of the residual indentation depth. The experimental results supported the analysis for the indentation of commercially pure titanium by a Vickers indenter. Slip bands around the indentation were observed, suggesting that the indentation deformation was controlled by dislocation motion. The indentation hardness decreased with the indentation load, showing the indentation size effect. The ratio of the total energy to the plastic energy was found to be proportional to the ratio of the maximum indentation depth to the residual indentation depth. The effects of holding time were examined on the time-dependent plastic deformation of the commercially pure titanium at ambient temperature.

Keywords

Hardness
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 4 , April 2008 , pp. 1068 - 1075
Copyright
Copyright © Materials Research Society 2008

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References

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