MECHANISMS OF MOLDING, PHASE FORMATION, AND STRUCTURING OF MATERIALS BASED IN TITANIUM BORIDES UNDER THE CONDITIONS OF COMBUSTION PROCESSES AND HIGH-TEMPERATURE SHEAR DEFORMATION

By the method of x-ray diff raction with a high time resolution, the authors have investigated the phase formation and structuring of titanium borides in the process of SHS with subsequent molding. The evolution of the structure of the material has been shown using the TiB–30 wt.% Ti composition as an example. It has been established that molding occurs due to the formation of an intermediate plastic matrix which serves two functions: the plasticizer and the reactant to form a strengthening phase. Calculations of the adiabatic combustion temperature and of the share of liquid titanium for TiB–Ti compositions with a content of free titanium of 5–80 wt.% have been carried out at temperatures of the original composition of 25–500o C. The processes of molding have been studied for TiB–Ti- and TiB2–Ti-based materials with a content of free titanium of 0–50 wt.% at temperatures of the original composition of 25–500o C
   
Author:  P. M. Bazhin, A. S. Konstantinov, A. P. Chizhikov, A. D. Prokopets, M. S. Antipov, and A. M. Stolin
Keywords:  molding, SHS, combustion, high-temperature shear deformation, titanium boride, phase formation, structuring
Page:  177