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Instrumented nanoindentation investigation into the mechanical behavior of ceramics at moderately elevated temperatures

Published online by Cambridge University Press:  06 September 2011

Vineet Bhakhri ,
Jianye Wang ,
Naeem Ur-rehman ,
Constantin Ciurea ,
Finn Giuliani  and
Luc J. Vandeperre
Vineet Bhakhri*
Affiliation:
Centre for Advanced Structural Ceramics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
Jianye Wang
Affiliation:
Centre for Advanced Structural Ceramics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
Naeem Ur-rehman
Affiliation:
Centre for Advanced Structural Ceramics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
Constantin Ciurea
Affiliation:
Centre for Advanced Structural Ceramics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
Finn Giuliani
Affiliation:
Centre for Advanced Structural Ceramics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
Luc J. Vandeperre
Affiliation:
Centre for Advanced Structural Ceramics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom; and Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
*
a)Address all correspondence to this author. e-mail: v.bhakhri@imperial.ac.uk
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Abstract

An analysis of indentation hardness data from three ceramic materials, zirconium diboride, silicon carbide, and titanium nitride, is presented to extract the fundamental deformation parameters at 295 to 623 K. The measured activation volume was of the order of 1 × b3 to 4 × b3 (b is the Burgers vector). The calculated activation energies were in the range of 0.75 to 1.61 eV and are typical of lattice-controlled dislocation glide mechanism. Using finite difference simulations, it was demonstrated that there is a significant difference between the plastic strain rate and the total strain rate for materials showing substantial elastic deformation (i.e., large hardness/elastic modulus ratio). Therefore, the measured total strain rates must be converted into plastic strain rates, which require a reduction during loading and an increase during the dwell at maximum load. Additionally, importance of quantification of instrumental thermal drift was discussed and use of either short duration indentation tests or high loads was emphasized.

Keywords

Activation analysisCeramicNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 1: Focus Issue: Instrumented Indentation , 14 January 2012 , pp. 65 - 75
Copyright
Copyright © Materials Research Society 2011

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