Abstract
Anisotropic dislocation nucleation of differently oriented zirconium diboride (ZrB2) grains in a polycrystalline ZrB2-based ceramic composite was investigated during nanoindentation with a Berkovich tip. Based on the Hertzian stress analysis of the measured strain bursts, the critical resolved shear stresses for slip systems of 101¯0112¯0, 101¯00001 and 101¯0112¯3 types were determined. Homogeneous dislocation nucleation was revealed with near theoretical critical resolved shear stress (~35 GPa) for each slip system. The analysis of the orientation dependence of the calculated maximal resolved shear stress values inferred anisotropic dislocation nucleation in ZrB2 grains with single and simultaneous activation of the investigated slip systems.
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