Nanoindentation study of amorphous-Co79Zr13Nb8/Cr multilayers

F. Lv, S. P. Wen, R. L. Zong, F. Zeng*, Y. Gao, F. Pan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The mechanical properties of Co79Zr13Nb8/Cr multilayers were investigated using nanoindentation. The hardness is higher than the average value calculated by rule-of-mixture. The hardness and the resistance to plastic deformation characterized by the ratio of H3/E2 vary similarly with periodicity (Λ). They all arrive to the maximum at Λ = 8 nm and decrease subsequently when the Λ increases. The hardness dependence on the Λ is fitted by Hall-Petch relation. The fitted index n is much lower than the normal value (~ 0.5) in many crystalline multilayers. The mutual restriction of shear band and dislocation in amorphous/crystalline structure, which is named structure barrier strengthening, should be main mechanism for the hardness enhancement. The SEM study of indents shows that the shear bands are distorted significantly at the smaller Λ (4 nm) and disappear at the larger Λ (> 20 nm). This morphology variation implies a potential improvement of plasticity caused by the restriction effect of the Cr crystalline layers on the shear bands propagation.

Original languageEnglish
Pages (from-to)3239-3245
Number of pages7
JournalSurface and Coatings Technology
Volume202
Issue number14
DOIs
Publication statusPublished - 15 Apr 2008
Externally publishedYes

Keywords

  • Mechanical properties
  • Metallic glass
  • Multilayer
  • Shear bands

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