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

Dub, S. N.; Petrusha, I. A.; Bushlya, V. M. LU ; Taniguchi, T.; Belous, V. A.; Tolmachova, G. N. and Andreev, A. V. (2017) In Journal of Superhard Materials 39(2). p.88-98
Abstract

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)... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cBN, mechanical properties, nanoindentation, nucleation of dislocations, theoretical shear strength
in
Journal of Superhard Materials
volume
39
issue
2
pages
11 pages
publisher
Springer
external identifiers
  • scopus:85018899078
ISSN
1063-4576
DOI
10.3103/S1063457617020034
language
English
LU publication?
yes
id
4caaa9df-8fe5-4df2-9729-9076eba28d2a
date added to LUP
2019-01-15 14:27:31
date last changed
2019-08-14 04:30:42
@article{4caaa9df-8fe5-4df2-9729-9076eba28d2a,
  abstract     = {<p>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.</p>},
  author       = {Dub, S. N. and Petrusha, I. A. and Bushlya, V. M. and Taniguchi, T. and Belous, V. A. and Tolmachova, G. N. and Andreev, A. V.},
  issn         = {1063-4576},
  keyword      = {cBN,mechanical properties,nanoindentation,nucleation of dislocations,theoretical shear strength},
  language     = {eng},
  month        = {03},
  number       = {2},
  pages        = {88--98},
  publisher    = {Springer},
  series       = {Journal of Superhard Materials},
  title        = {Theoretical shear strength and the onset of plasticity in nanodeformation of cubic boron nitride},
  url          = {http://dx.doi.org/10.3103/S1063457617020034},
  volume       = {39},
  year         = {2017},
}