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

Published online by Cambridge University Press:  31 January 2011

X. Chu ,
M. S. Wong ,
W. D. Sproul  and
S. A. Barnett
X. Chu
Affiliation:
Department of Materials Science and Engineering and the Advanced Coating Technology Group, Northwestern University, Evanston, Illinois 60208
M. S. Wong
Affiliation:
Department of Materials Science and Engineering and the Advanced Coating Technology Group, Northwestern University, Evanston, Illinois 60208
W. D. Sproul
Affiliation:
Department of Materials Science and Engineering and the Advanced Coating Technology Group, Northwestern University, Evanston, Illinois 60208
S. A. Barnett
Affiliation:
Department of Materials Science and Engineering and the Advanced Coating Technology Group, Northwestern University, Evanston, Illinois 60208
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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.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2500 - 2507
Copyright
Copyright © Materials Research Society 1999

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