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The Physics of Metals and Metallography

, Volume 117, Issue 6, pp 594–601 | Cite as

Superhardness effect in transition-metal diborides films

  • A. I. BazhinEmail author
  • A. A. Goncharov
  • A. D. Pogrebnyak
  • V. A. Stupak
  • S. A. Goncharova
Strength and Plasticity

Abstract

The structure, composition, and properties of transition-metal diboride films have been studied. It was shown that they are characterized by a wide range of structural states, namely from amorphous-like to nanocrystalline with crystallite sizes of 1–50 nm. The characteristic peculiarity of the structure of film transition-metal diborides with high physical and mechanical properties is the formation of a nanocrystalline (columnar) structure with the growth texture in plane [00.1] and a nanocrystallite size of 20–50 nm. The element composition of a superhard highly textured film transition-metal diborides was studied by ion mass spectrometry and Auger electron spectroscopy. The overstoichiometry effect in nanocrystalline transitionmetal diboride films is explained. It was shown that this effect is related to the formation of an additional B⎯B covalent bond, which is realized at subgrain boundaries and leads to the appearance of superhardness in the formed coatings.

Keywords

films texture composition properties borides 

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • A. I. Bazhin
    • 1
    Email author
  • A. A. Goncharov
    • 2
  • A. D. Pogrebnyak
    • 2
  • V. A. Stupak
    • 1
  • S. A. Goncharova
    • 2
  1. 1.Scientific Center of Physical TechnologiesNational Academy of Sciences and Ministry of Education and Science of UkraineKhar’kovUkraine
  2. 2.Sumy State UniversitySumyUkraine

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