Abstract
Methods of shock-wave physics are used to perform experimental investigations of the elastoplastic and strength properties of cubic modification of polycrystalline boron nitride. The samples are prepared by pressing to a pressure of 7–8 GPa at a temperature of 1700–1800 °C and rank just a little below diamond in hardness. The measurements are performed under conditions of the samples being acted upon by plane shock waves with the pressure behind the front of up to 85 GPa and duration of ∼10−6 s. It is demonstrated that a two-wave configuration consisting of an elastic precursor and a plastic compression wave is formed at the amplitude of shock compression of over 60 GPa. The dynamic yield strength, determined by the amplitude of elastic precursor, depends on the structure of samples and varies in the range from 31 to 49 GPa. The dynamic strength, measured under conditions of pulsed tension in expansion waves, is likewise defined by the structure of samples and, in the elastic region of deformation, lies in the range from 0.7 to 1.6 GPa.
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