The effect of indenter angle on the microindentation hardness

J. Qin, Yonggang Huang*, K. C. Hwang, J. Song, G. M. Pharr

*Corresponding author for this work

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Nix and Gao established an important relation between the microindentation hardness and indentation depth. It agrees well with the microindentation experiments for the Berkovich indenter. However, it is unclear whether it holds for other indenters with different indenter angles. We use the conventional theory of mechanism-based strain gradient plasticity established from the Taylor dislocation model to study the effect of indenter angles on the microindentation hardness. It is shown that the Nix-Gao relation between the microindentation hardness and indentation depth also holds for other indenter angles. The effect of friction is negligible for relatively flat indenters (e.g. Berkovich indenter), but may be significant for sharp indenters (e.g. cubic indenter).

Original languageEnglish (US)
Pages (from-to)6127-6132
Number of pages6
JournalActa Materialia
Volume55
Issue number18
DOIs
StatePublished - Oct 1 2007

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Hardness
Indentation
Plasticity
Friction
Experiments

Keywords

  • Berkovich indenter
  • Indenter angle
  • Microindentation hardness
  • Strain gradient
  • Taylor dislocation model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Qin, J. ; Huang, Yonggang ; Hwang, K. C. ; Song, J. ; Pharr, G. M. / The effect of indenter angle on the microindentation hardness. In: Acta Materialia. 2007 ; Vol. 55, No. 18. pp. 6127-6132.
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The effect of indenter angle on the microindentation hardness. / Qin, J.; Huang, Yonggang; Hwang, K. C.; Song, J.; Pharr, G. M.

In: Acta Materialia, Vol. 55, No. 18, 01.10.2007, p. 6127-6132.

Research output: Contribution to journalArticle

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T1 - The effect of indenter angle on the microindentation hardness

AU - Qin, J.

AU - Huang, Yonggang

AU - Hwang, K. C.

AU - Song, J.

AU - Pharr, G. M.

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AB - Nix and Gao established an important relation between the microindentation hardness and indentation depth. It agrees well with the microindentation experiments for the Berkovich indenter. However, it is unclear whether it holds for other indenters with different indenter angles. We use the conventional theory of mechanism-based strain gradient plasticity established from the Taylor dislocation model to study the effect of indenter angles on the microindentation hardness. It is shown that the Nix-Gao relation between the microindentation hardness and indentation depth also holds for other indenter angles. The effect of friction is negligible for relatively flat indenters (e.g. Berkovich indenter), but may be significant for sharp indenters (e.g. cubic indenter).

KW - Berkovich indenter

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KW - Strain gradient

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