Abstract
The mechanical properties of polycrystalline boron nitride were examined to evaluate the stresses resulting in microcracking and phase transformations. Dependence of the internal stress level on the phase composition of BN polycrystals was assessed. Both wurtzite and sphalerite lattices were tested. X-ray diffraction was used. Thermal cycling and compressive loading results are given. Fracture resistance, elasticity, and hardness dependence on stress level along with stress dependence on grain anisotropy were evaluated. A high level of internal stress led to explosive failure under compression. Tests demonstrated the high fracture resistance of heterophase highly dispersed polycrystals.
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