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Effect of Processing on Nix-Gao Bilinear Indentation Results Obtained for High Purity Iron

Published online by Cambridge University Press:  01 March 2018

Prasad Pramod Soman*
Affiliation:
Michigan Technological University, Houghton, MI, United States.
Erik Gregory Herbert
Affiliation:
Michigan Technological University, Houghton, MI, United States.
Katerina E Aifantis
Affiliation:
Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, United States.
Stephen A Hackney
Affiliation:
Michigan Technological University, Houghton, MI, United States.
*
*(Email: ppsoman@mtu.edu)

Abstract

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Instrumented indentation of a high purity Fe surface with unresolved surface deformation due to mechanical polishing is compared to the same grain surface annealed at increasing time and temperature. The differences in indentation size effect behavior with annealing are correlated with hardness and electron backscatter diffraction measurements as independent measures of surface layer deformation. It is found that the Nix Gao plot evolves from non-linear (bilinear) towards the predicted linear relationship as the surface deformation is removed. The experimental observations are rationalized by inclusion of a depth dependent, polishing induced forest dislocation density within the Nix-Gao model.

Type
Articles
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Materials Research Society 2018

References

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