Journal of Superhard Materials

, Volume 39, Issue 2, pp 88–98 | Cite as

Theoretical shear strength and the onset of plasticity in nanodeformation of cubic boron nitride

  • S. N. Dub
  • I. A. Petrusha
  • V. M. Bushlya
  • T. Taniguchi
  • V. A. Belous
  • G. N. Tolmachova
  • A. V. Andreev
Production, Structure, Properties


The nanoindentation in the continuous stiffness measurement mode was used to investigate the onset of plasticity at the nanodeformation of cubic boron nitride (cBN). This technique allows us to reveal an elastic-plastic transition in the contact and to measure the yield strength of cBN at the nanoscale. An abrupt elastoplastic transition (a pop-in) was observed in the (111) cBN single crystal as a result of a homogeneous or heterogeneous nucleation of dislocations in the previously dislocations-free region under the contact. The analysis of the data obtained at the homogeneous nucleation of dislocations in the contact region made it possible to experimentally estimate the theoretical shear strength of cBN and its ideal (elastic) hardness. In a sample of the fine-grained cBN with a nanotwinned substructure a smooth elastoplastic transition was observed in consequence of the propagation and multiplication of already existing dislocations in the contact region.


cBN mechanical properties nanoindentation nucleation of dislocations theoretical shear strength 


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Copyright information

© Allerton Press, Inc. 2017

Authors and Affiliations

  • S. N. Dub
    • 1
  • I. A. Petrusha
    • 1
  • V. M. Bushlya
    • 2
  • T. Taniguchi
    • 3
  • V. A. Belous
    • 4
  • G. N. Tolmachova
    • 4
  • A. V. Andreev
    • 3
  1. 1.Bakul Institute for Superhard MaterialsNational Academy of Sciences of UkraineKievUkraine
  2. 2.Division of Production and Materials EngineeringLund UniversityLundSweden
  3. 3.National Institute for Material ScienceTsukuba, IbarakiJapan
  4. 4.Kharkiv Institute of Physics and TechnologyKievUkraine

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