Al-Ti-B₄C materials obtained by high-temperature synthesis and used as a master-alloy for aluminum

¹ National Research Tomsk State University, 36 Lenin avenue, 634050, Tomsk, Russia
² Institute for Problems of Chemical & Energetic Technologies of the Siberian Branch of the Russian Academy of Sciences, 1, Sotsialisticheskaja street, 659332, Biysk, Russia

^* Corresponding author: y.a.dubkova@niipmm.tsu.ru

Abstract

The paper presents microstructure, composition, and burning rate of Al alloy produced by high-temperature synthesis (SHS) from powder mixture Al-Ti-B₄C with different concentration of Al powder. It has been established that the phase composition of materials obtained at gas-free combustion includes TiB₂, Al, and TiC. It is shown that Al content growth powder in initial Al-Ti- B₄C mixture from 7.5 to 40 wt.% reduces the burning rate of the powder from 9*10^-3 to 1.8*10^-3 m/s. For the system consisting of 60 wt.% of (Ti + B₄C) and 40 wt.% of Al there is the increase in the porosity of the compacted initial powder mixture from 30 to 51 and reduction in the burning rate from 1.8 * 10^-3 to 1 * 10^-3 m/s. The introduction of 0.2 wt.% of the obtained SHS materials into the melt of pure aluminum causes reduction of the grain size of the resulting alloy from 1200 to 410 μm.