Mechanical hysteresis of hexagonal boron nitride

Abstract

Hexagonal boron nitride (h-BN) is an important structural material with layered microstructure. Because of the plastic anisotropy, this material shows obvious mechanical hysteresis (nonlinear elastic deformation). There are hysteretic loops at the cyclical load-unload stress-strain curves of h-BN. Consequently, two hot-pressed h-BN cylinders with different textures were studied. The mechanical hysteresis is heavily texture-dependent. The area of hysteretic loop is linearly related with the square of loading stresslevel. Two minor loops attached on the hysteretic loops with the same extreme stresses have congruent shapes. It can be concluded that the mechanical hysteresis of h-BN can be explained by a Kink Nonlinear Elastic model developed from the study of a ternary carbide Ti₃SiC₂.

Keywords

boron nitride / nonlinear elastic deformation / kink band / texture

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