The Nano-Jackhammer effect in probing near-surface mechanical properties

M. J. Cordill, M. S. Lund, J. Parker, C. Leighton, A. K. Nair, D. Farkas, N. R. Moody, W. W. Gerberich

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Because of its ease of implementation and insensitivity to indenter drift, dynamic indentation techniques have been frequently used to measure mechanical properties of bulk and thin film materials as a function of indenter displacement. However, the actual effect of the oscillating tip on the material response has not been examined. Recently, it has been shown that the oscillation used with dynamic indentation techniques alters the measured hardness value of ductile metallic materials, especially at depths less than 200 nm. The alteration in the hardness is due to the added energy associated with the oscillation which assists dislocation nucleation. Atomistic simulations on nickel thin films agree with experiments that more dislocations are nucleated during dynamic indents than with quasi-static indents. Through the analysis of quasi-static and dynamic indents made into nickel single crystals and thin films, a theory to describe this phenomenon is presented. This is coined the Nano-Jackhammer effect, a combination of dislocation nucleation and strain rate sensitivity caused by indentation with a superimposed dynamic oscillation.

Original languageEnglish (US)
Pages (from-to)2045-2058
Number of pages14
JournalInternational Journal of Plasticity
Volume25
Issue number11
DOIs
StatePublished - Nov 1 2009

Fingerprint

Mechanical properties
Indentation
Nickel
Thin films
Nucleation
Hardness
Strain rate
Single crystals
Experiments

Keywords

  • Cyclic loading
  • Dislocations
  • Dynamic fracture
  • Mechanical testing
  • Numerical algorithms

Cite this

Cordill, M. J., Lund, M. S., Parker, J., Leighton, C., Nair, A. K., Farkas, D., ... Gerberich, W. W. (2009). The Nano-Jackhammer effect in probing near-surface mechanical properties. International Journal of Plasticity, 25(11), 2045-2058. https://doi.org/10.1016/j.ijplas.2008.12.015

The Nano-Jackhammer effect in probing near-surface mechanical properties. / Cordill, M. J.; Lund, M. S.; Parker, J.; Leighton, C.; Nair, A. K.; Farkas, D.; Moody, N. R.; Gerberich, W. W.

In: International Journal of Plasticity, Vol. 25, No. 11, 01.11.2009, p. 2045-2058.

Research output: Contribution to journalArticle

Cordill, MJ, Lund, MS, Parker, J, Leighton, C, Nair, AK, Farkas, D, Moody, NR & Gerberich, WW 2009, 'The Nano-Jackhammer effect in probing near-surface mechanical properties', International Journal of Plasticity, vol. 25, no. 11, pp. 2045-2058. https://doi.org/10.1016/j.ijplas.2008.12.015
Cordill, M. J. ; Lund, M. S. ; Parker, J. ; Leighton, C. ; Nair, A. K. ; Farkas, D. ; Moody, N. R. ; Gerberich, W. W. / The Nano-Jackhammer effect in probing near-surface mechanical properties. In: International Journal of Plasticity. 2009 ; Vol. 25, No. 11. pp. 2045-2058.
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