Regular articleAnisotropic slip activation via homogeneous dislocation nucleation in ZrB2 ceramic grains during nanoindentation
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Acknowledgements
The authors gratefully acknowledge the financial support from projects: APVV-15-0469, APVV-0108-12, VEGA 2/0163/16, VEGA 2/0189/15, NanoCEXmat II (ITMS 26220120035), FNP – No. POWROTY/2016-1/3.
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2021, International Journal of Refractory Metals and Hard MaterialsCitation Excerpt :It should be noticed that the randomized orientation of the ZrB2 crystals in the composite causes a wide range of stress distribution on the basal plans of hexagonal ZrB2 lattice. When the crystal orientation fulfills the condition for the maximum shear component of the applied tension on the basal plans (the angel between basal orientation and the shear component of the applied stress becomes zero), slip systems of the hexagonal lattice may be activated in nano-scale and promote dislocation movement as well as dislocation nucleation [39,40,42]. Such behavior has also been observed through the hot-pressing of ZrB2-SiC and ZrB2-B4C composites [43,44].
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2020, Journal of the European Ceramic SocietyCitation Excerpt :In some cases, mainly in the case of indentation of ZrB2 grain but sometimes also Al2O3 grains, typical ‘hardness drops’ are visible, which correspond to sudden displacement bursts, so-called pop-ins, Fig. 3b. During the indentation o ZrB2 grains we found many times these so-called pop-in mechanisms in the indentation load range from 0.2 to 8 mN, described by Guicuardi and Csanadi, [17–20]. Similar pop-in mechanisms have been recognized during the indentation of alumina grains as well.