Kinematic and dynamic characterization of plastic instabilities occurring in nano- and microindentation tests

N. Chinh, Gy Horváth, Z. Kovács, A. Juhász, Gy Bérces, J. Lendvai

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This paper surveys the phenomenon of plastic instabilities occurring in depth sensing indentation measurements, during which a stepwise increase has been observed in the indentation depth-load (F-h) curves measured in constant loading rate mode. In these measurements, plastic instability - serrated indentation - manifests itself as hardness oscillations around a nearly constant value of the conventional dynamic microhardness. Investigations presented here are focused on both kinematic and dynamic characterization of Portevin-Le Châtelier type indentation instabilities. The effect of important factors such as solute concentration and polycrystalline grain size is described and discussed. Taking into account the experimental observations, a macro-mechanical dynamic model was also proposed for the characterization of indentation instabilities.

Original languageEnglish
Pages (from-to)100-107
Number of pages8
JournalMaterials Science and Engineering A
Volume409
Issue number1-2
DOIs
Publication statusPublished - Nov 15 2005

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Nanoindentation
nanoindentation
indentation
Indentation
microhardness
Kinematics
kinematics
plastics
Plastics
loading rate
dynamic models
Microhardness
Macros
Dynamic models
solutes
hardness
grain size
Hardness
oscillations
curves

Keywords

  • Dynamic model
  • Grain size
  • Hardness oscillation
  • Plastic instabilities
  • Serrated indentation
  • Solute concentration

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Kinematic and dynamic characterization of plastic instabilities occurring in nano- and microindentation tests. / Chinh, N.; Horváth, Gy; Kovács, Z.; Juhász, A.; Bérces, Gy; Lendvai, J.

In: Materials Science and Engineering A, Vol. 409, No. 1-2, 15.11.2005, p. 100-107.

Research output: Contribution to journalArticle

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