Phase State of Reaction Products of a Mechanically Activated Ti + Al Mixture Synthesized During Detonation of a Gaseous Mixture
M. V. Loginova1, A. V. Sobachkin1, A. A. Sitnikov1, V. I. Yakovlev1, A. Yu. Myasnikov1,2, V. Yu. Filimonov1,3
1Polzunov Altai State Technical University, Barnaul, Russia
2Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
3Institute for Water and Environmental Problems, Siberian Branch, Russian Academy of Sciences, Barnaul, Russia
Keywords: powder mixture, mechanical activation, mechanocomposites, granulometric composition, shock-wave synthesis, extreme thermal impact, X-ray diffractometry, phase composition
Abstract
Model experiments on shock-wave synthesis in mechanocomposites of the composition 64% Ti + 36% Al were carried out in the developed flow-type pulse reactor. Composites after 3,5 and 7 min of mechanical activation, separated into four fractions, were subjected to extreme thermal action. A planetary ball mill “Activator-2SL” was used to activate the mixture. It was experimentally established that different times of mechanical activation action and different granulometry of powders do not affect the qualitative phase composition of the synthesis products. The reaction products include amorphized Al, underreacted Ti, intermetallic compounds TiAl, TiAl3 and Ti3Al, as well as nuclei of metastable phases or solid solutions based on Ti, which are in a nonequilibrium weakly ordered state. It was revealed that varying the time of mechanical activation and granulometric composition changes the quantitative content of the phase composition of the final synthesis products. The microstructures of the obtained samples confirm the formation of a multiphase product with a partially ordered structure, having amorphous and crystalline components.
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