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Mechanical properties of HfB2 whiskers

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Abstract

Nanoindentation has been used to study mechanical behavior of HfB2 whiskers 10–20μm in diameter in a directionally reinforced ceramics. For comparison a bulk (0001) HfB2 single crystal 5 mm in diameter has been tested. For both the samples a pop-in due to the nucleation of dislocations in a previously dislocation-free region under the indent has been observed. It has been shown that for a HfB2 whisker in reinforced ceramics the critical load of the elastoplastic transition is twice as high as for a bulk HfB2 single crystal and, the maximum shear stress, at which the nucleation of the first dislocation loop in a HfB2 whisker occurs, approaches to the theoretical shear strength value. The observed effect has been caused by the higher structural perfection of whiskers as compared with a bulk sample. Hardness and elastic modulus of the HfB2 whisker are higher than that of the bulk crystal by 10 and 3%, respectively.

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Authors and Affiliations

  1. Bakul Institute for Superhard Materials, National Academy of Sciences of Ukraine, vul. Avtozavods’ka 2, Kiev, 04074, Ukraine

    S. N. Dub, P. I. Loboda & V. N. Tkach

  2. KPI National Technical University of Ukraine, pr. Peremogy, 37, Kiev, 03056, Ukraine

    Yu. I. Bogomol

  3. NNC Kharkovskii Physicotechnical Institute, National Academy of Sciences of Ukraine, Kiev, Ukraine

    G. N. Tolmacheva

Authors
  1. S. N. Dub
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  2. P. I. Loboda
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  3. Yu. I. Bogomol
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  4. G. N. Tolmacheva
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  5. V. N. Tkach
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Additional information

Original Russian Text © S.N. Dub, P.I. Loboda, Yu.I. Bogomol, G.N. Tolmacheva, V.N. Tkach, 2013, published in Sverkhtverdye Materialy, 2013, Vol. 35, No. 4, pp. 51–62.

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Dub, S.N., Loboda, P.I., Bogomol, Y.I. et al. Mechanical properties of HfB2 whiskers. J. Superhard Mater. 35, 234–241 (2013). https://doi.org/10.3103/S1063457613040059

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  • DOI: https://doi.org/10.3103/S1063457613040059

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