Influence of Conditions of Self-Propagating High-Temperature Synthesis on Phase Composition and Structure of Materials Based on Ti–B

The results of studying the effect of shear deformation and the medium on the phase composition and structure of materials based on Ti–B obtained under the conditions of self-propagating high-temperature synthesis (SHS) are presented. The object of the study was titanium and boron powders in the ratio of 87 wt % Ti and 13 wt % B, which were taken from the calculation to form 70 wt % TiB and 30 wt % Ti during their direct synthesis in the SHS mode. These materials have been synthesized under four conditions: SHS without deformation (i) in air and (ii) helium, (iii) free SHS compression, and (iv) SHS extrusion. It is shown that shear deformation contributes to a more complete course of phase formation processes and uniform distribution of titanium monoboride in the matrix from the Ti[B] x solid solution due to the involvement of the entire volume of the synthesized material in the synthesis process and more uniform heat removal. For each material obtained by these methods, the microstructure has been studied, the quantitative phase composition has been determined, and the crystal lattice parameters of the main TiB phase have been calculated.