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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*10-3to 1.8*10-3m/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 * 10-3to 1 * 10-3m/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.
Highlights
Due to the wide use of aluminum alloys in mechanical engineering and aircraft building, there is a great concern about increasing the strength and ductility of aluminum alloys
This is due to the fact that aluminum powder contained in the initial dry mix acts as an inert diluent, which reduces the rate and adiabatic temperature of the charge reaction by absorbing the heat released during synthesis [12]
The conducted studies show the prospect of manufacturing master alloys by the SHS method intended for modifying the structure of aluminum
Summary
Due to the wide use of aluminum alloys in mechanical engineering and aircraft building, there is a great concern about increasing the strength and ductility of aluminum alloys. Modifiers of aluminum alloys are titanium diboride and titanium carbide [1,2,3,4]. In the composition of the modifying mixture, these materials play the role of nuclei of crystallization in aluminumbased alloys. It is known that the size of the injected refractory particles affects the grain size in aluminum alloys [2, 3]. The direct introduction of refractory compounds into the aluminum melt is very difficult due to flotation and poor wettability of the particles. One approach to solving this problem is the use of a master alloys based on a metal matrix containing various micro or nanoparticles of refractory compounds like TiB2, TiC, etc. One approach to solving this problem is the use of a master alloys based on a metal matrix containing various micro or nanoparticles of refractory compounds like TiB2, TiC, etc. [5,6,7], produced mostly by selfpropagating high-temperature synthesis (SHS)
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