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Open AccessArticle

Formation of Phases in Reactively Sintered TiAl3 Alloy

1
Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
2
Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
3
COMTES FHT, Průmyslová 995, 334 41 Dobřany, Czech Republic
4
Department of Solid State Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Tornabene
Molecules 2020, 25(8), 1912; https://doi.org/10.3390/molecules25081912
Received: 31 March 2020 / Revised: 18 April 2020 / Accepted: 19 April 2020 / Published: 21 April 2020
(This article belongs to the Special Issue Intermetallics: Synthesis, Structure, Function)
This work highlights new results on the synthesis of the TiAl3 intermetallic phase using self-propagating high-temperature synthesis. This method is considered a promising sintering route for intermetallic compounds. It was found that the reactions proceed in two stages. Below the melting point of aluminum, the Ti2Al5 phase forms at 450 °C after long annealing times by a direct solid-state reaction between the aluminum and titanium, and is converted consequently to TiAl3. This is a completely new finding; until now, many authors have believed in the preferential formation of the TiAl3 phase. The second stage, the self-propagating strongly exothermic reaction, proceeds above the melting point of aluminum. It leads to the formation of the TiAl3 phase accompanied by Ti2Al5 and Ti3Al phases. The reaction mechanism was shown in the form of chemical equations, which were supported by calculating Gibbs energy. Reaction temperatures (Tonset, Tmaximum, and Toffset) were determined after induction heating thanks to recording by an optical pyrometer. This finding provides completely new opportunities for the determination of activation energy at heating rates, in which common calorimeters are not able to detect a response or even measure. Now, the whole procedure will become accessible. View Full-Text
Keywords: Ti-Al system; reactive sintering; combustion; kinetics; microstructure Ti-Al system; reactive sintering; combustion; kinetics; microstructure
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MDPI and ACS Style

Školáková, A.; Salvetr, P.; Leitner, J.; Lovaši, T.; Novák, P. Formation of Phases in Reactively Sintered TiAl3 Alloy. Molecules 2020, 25, 1912. https://doi.org/10.3390/molecules25081912

AMA Style

Školáková A, Salvetr P, Leitner J, Lovaši T, Novák P. Formation of Phases in Reactively Sintered TiAl3 Alloy. Molecules. 2020; 25(8):1912. https://doi.org/10.3390/molecules25081912

Chicago/Turabian Style

Školáková, Andrea; Salvetr, Pavel; Leitner, Jindřich; Lovaši, Tomáš; Novák, Pavel. 2020. "Formation of Phases in Reactively Sintered TiAl3 Alloy" Molecules 25, no. 8: 1912. https://doi.org/10.3390/molecules25081912

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