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Ni3N compound layers produced by gaseous nitriding of nickel substrates; layer growth, macrostresses and intrinsic elastic anisotropy

Published online by Cambridge University Press:  12 March 2012

Andreas Leineweber*
Affiliation:
Max Planck Institute for Intelligent Systems, D-70569 Stuttgart, Germany
Franziska Lienert
Affiliation:
Institute for Materials Science, University of Stuttgart, D-70569 Stuttgart, Germany
Shun Li Shang
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
Zi-Kui Liu
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
Eric Jan Mittemeijer
Affiliation:
Max Planck Institute for Intelligent Systems, D-70569 Stuttgart, Germany; and Institute for Materials Science, University of Stuttgart, D-70569 Stuttgart, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Ni3N was prepared by gaseous nitriding of nickel substrates using gas mixtures of high nitrogen activities, composed of NH3 and H2 at 1 atm and at temperatures between 175 °C and 550 °C. At least above 300 °C closed Ni3N layers developed, which possess distinct compressive macrostrain parallel to the surface. The observed hkl-anisotropy of the macrostrain could be ascribed to the elastic anisotropy as indicated by the single-crystal elastic constants of Ni3N obtained from first-principles calculations performed in this work. The macrostress originates from the thermal misfit between layer and substrate, developing upon cooling. The extent of macrostress is reduced by partial misfit accommodation by plastic deformation as well as by porosity.

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Copyright © Materials Research Society 2012

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References

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