Effect of the indenter size on the indentation of aluminum

Fuqian Yang, Lingling Peng, Kenji Okazaki

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The indentation behavior of annealed Al was examined using spherical indenters of different radii (0.01, 0.05, 0.1, 0.2 and 0.5 mm). The indentation stress-strain curves displayed similar strain-hardening behavior regardless of the size of indenter, while the altitude increased with the decrease of the size of indenter. A master curve was constructed, which showed different work-hardening behavior from the indentation stress-strain curves. Depending on the size of indenter, the indentation stress-strain curves deviated from the master curve at different levels of stresses. Using the dislocation dynamics, it was found that the initial dislocation density at macroscopic yielding in the indentations was a linear function of the reciprocal of the square root of the size of indenter.

Original languageEnglish
Pages (from-to)321-325
Number of pages5
JournalMaterials Characterization
Issue number4-5
StatePublished - Dec 2006

Bibliographical note

Funding Information:
The valuable comments by the reviewer are especially appreciated. This research is supported by NSF through a grant DMR-0211706 monitored by Drs. Guebre Tessema and Bruce A. MacDonald and Kentucky Science and Engineering Foundation through a grant KSEF-148-502-03-73.


  • Dislocation dynamics
  • Master curve
  • Micro-indentation
  • Size effect

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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