Phase State of Reaction Products of a Mechanically Activated Ti $${+}$$ Al Mixture Synthesized during Gas Mixture Detonation

Model experiments on shock-wave synthesis in $$64\%$$ Ti $$+$$ 36 $$\%$$ Al mechanical composites are carried out in a developed flow-type pulsed reactor. Extreme thermal action is applied to composites after 3, 5, and 7 min of mechanical activation, separated into four grain sizes. The mixture is activated using an Activator-2SL planetary ball mill. Experiments reveal that varying mechanical activation durations and different grain size analysis have no effect on the qualitative phase composition of synthesis products. Reaction products include amorphized Al, underreacted Ti, intermetallic compounds (TiAl, TiAl $${}_{3}$$ , and Ti $${}_{3}$$ Al), and the nuclei of metastable phases or Ti-based solid solutions, which are in a nonequilibrium weakly ordered state. It is revealed that varying the mechanical activation duration and the grain size composition changes the quantitative content of the phase composition of the final synthesis products. The microstructures of the resulting samples confirm the formation of a multiphase product with a partially ordered structure, having amorphous and crystalline components.