Deposition, structure, and hardness of polycrystalline transition-metal nitride superlattice films

X. Chu*, M. S. Wong, W. D. Sproul, S. A. Barnett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Polycrystalline TiN/VN, NbN/VN, and TiN/NbN superlattices with periods Λ between 2 and 160 nm were deposited onto steel substrates using an opposed-cathode reactive magnetron sputtering system. The nitrogen partial pressure and the substrate bias values were optimized in order to obtain dense stoichiometric films, which yielded the highest Vickers hardnesses Hv. Hv for TiN/VN and TiN/NbN superlattices reached maximum values of ≈5000 kgf/mm2 at Λ ≈ 5-10 nm, compared with ≈2000 kgf/mm2 for homogeneous TiN, NbN, and VN films. In contrast, Hv ≈ 2000 kgf/mm2 was obtained for VN/NbN superlattices independent of Λ. Model calculations in which the hardness enhancement was proportional to the difference in layer shear moduli gave good agreement with the data. The lack of hardness enhancement in VN/NbN indicates that any other hardening mechanisms, such as coherency strains and dislocation blocking by interfacial misfit dislocations, were not important.

Original languageEnglish (US)
Pages (from-to)2500-2507
Number of pages8
JournalJournal of Materials Research
Volume14
Issue number6
DOIs
StatePublished - Jun 1999

ASJC Scopus subject areas

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

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