EFFECT OF GAMMA-IRRADIATION OF Ti+Al MECHANOCOMPOSITES ON THE PHASE COMPOSITION OF MATERIALS UNDER EXTREME THERMAL EXPOSURE IN A FLOW REACTOR

10.25712/ASTU.1811-1416.2022.03.003

Abstract

The analysis of experimental data obtained under extreme thermal exposure in a pulsed flow reactor of mechanocomposites of the composition Al + Ti without gamma irradiation and gamma-irradiated mechanoactivated precursors of different granulometric composition is carried out. To obtain precursors, the powder mixture was mechanically activated in a planetary ball mill «Activator-2SL» with an energy milling of 50 g and an activation time of 7 minutes. Irradiation of mechanocomposites with γ-quanta was carried out on a stationary installation «Researcher» (isotope ⁶⁰Co) with an accumulated dose of Dy = 5.5·10⁴ Gy. Further, experimental studies were carried out on the shock-wave synthesis of prepared precursors. Experimental studies on extreme thermal effects on the obtained precursors were carried out on an experimental diagnostic complex developed in the laboratory of the Evstigneev PNIL SHS AltSTU (Barnaul, Russia), which includes a pulsed flow reactor and a device for capturing reaction products. It was revealed that the preliminary effect of gamma-irradiation with a dose of 5.5·10⁴ Gy on mechanically activated precursors practically does not affect the qualitative phase composition of the reaction products obtained by shock-wave action in a pulsed flow reactor. The reaction products contain amorphized Al, under-reacted Ti, the intermetallic compounds TiAl, TiAl₃ and Ti₃Al, as well as the nuclei of metastable phases or Ti-based solid solutions in a nonequilibrium weakly ordered state. The effect on the quantitative content of phases in the final products has an additional effect of gamma-irradiation on the precursors of Ti + Al and the variation of their granulometric composition.