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

Prasad Pramod Soman; Erik Gregory Herbert; Katerina E. Aifantis; Stephen A. Hackney

doi:10.1557/adv.2018.135

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

Prasad Pramod Soman, Erik Gregory Herbert, Katerina E. Aifantis, Stephen A. Hackney

Civil and Architectural Engineering and Mechanics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	477-486
Number of pages	10
Journal	MRS Advances
Volume	3
Issue number	8-9
DOIs	https://doi.org/10.1557/adv.2018.135
State	Published - 2018

Keywords

grain boundaries
hardness
nano-indentation

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
General Materials Science

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10.1557/adv.2018.135

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title = "Effect of Processing on Nix-Gao Bilinear Indentation Results Obtained for High Purity Iron",

abstract = "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.",

keywords = "grain boundaries, hardness, nano-indentation",

author = "Soman, {Prasad Pramod} and Herbert, {Erik Gregory} and Aifantis, {Katerina E.} and Hackney, {Stephen A.}",

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AU - Soman, Prasad Pramod

AU - Herbert, Erik Gregory

AU - Aifantis, Katerina E.

AU - Hackney, Stephen A.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

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KW - nano-indentation

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

Abstract

Keywords

ASJC Scopus subject areas

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