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Characterization and investigation of size effect in nano-impact indentations performed using cube-corner indenter tip

Published online by Cambridge University Press:  22 May 2017

Abhi Ghosh ,
Sumin Jin ,
Javier Arreguin-Zavala  and
Mathieu Brochu
Abhi Ghosh
Affiliation:
Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada
Sumin Jin
Affiliation:
Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada
Javier Arreguin-Zavala
Affiliation:
Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada
Mathieu Brochu*
Affiliation:
Department of Mining and Materials Engineering, McGill University, Montreal H3A 0C5, Quebec, Canada
*
a) Address all correspondence to this author. e-mail: Mathieu.brochu@mcgill.ca
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Abstract

The traditional macro-scale form of dynamic indentation measures the dynamic deformation behavior of a material by simulating impact conditions. Similarly, the nano-impact indentation technique, with small-scale contacts and high spatial resolutions, is a novel technique for obtaining mechanical properties of materials at dynamic strain rates (>102 s−1). Nano-impact hardness values display a decreasing trend or size effect that continues for several micrometers of indentation depth, compared to the primarily sub micrometer depth range of size effect in quasi-static nanoindentations. For the first time, the factors behind the enhanced size effects for dynamic micro-scale indentations have been investigated by the current work: non-uniform loading and resulting instability using strain rate profiles, plastic wave behavior during loading using resistance force versus indentation depth profiles, quantification of energy of the dynamic plastic wave, and localization of impact strain using electron backscattered diffraction (EBSD) mapping of the strain affected vicinity of indentation imprints.

Keywords

structuraldislocationnanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2241 - 2248
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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