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Article

Mechanism of the Intermediary Phase Formation in Ti-20 wt. % Al Mixture during Pressureless Reactive Sintering

1
Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
2
Department of Solid State Engineering, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
3
Department of Solid State Sciences, Ghent University, Krijgslaan 281 S1 9000 Gent, Belgium
*
Author to whom correspondence should be addressed.
Materials 2019, 12(13), 2171; https://doi.org/10.3390/ma12132171
Received: 7 June 2019 / Revised: 2 July 2019 / Accepted: 4 July 2019 / Published: 6 July 2019
(This article belongs to the Collection Advanced Powder Metallurgy Technologies)
This work aims to describe the mechanism of intermediary phases formation in TiAl20 (wt. %) alloy composition during reactive sintering. The reaction between titanium and aluminum powders was studied by in situ diffraction and the results were confirmed by annealing at various temperatures. It was found that the Ti2Al5 phase formed preferentially and its formation was detected at 400 °C. So far, this phase has never been found in this alloy composition during reactive sintering processes. Subsequently, the Ti2Al5 phase reacted with the titanium, and the formation of the major phase, Ti3Al, was accompanied by the minor phase, TiAl. Equations of the proposed reactions are presented in this paper and their thermodynamic and kinetic feasibility are supported by Gibbs energies of reaction and reaction enthalpies. View Full-Text
Keywords: in situ diffraction; aluminides; reactive sintering; mechanism; powder metallurgy in situ diffraction; aluminides; reactive sintering; mechanism; powder metallurgy
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MDPI and ACS Style

Školáková, A.; Salvetr, P.; Novák, P.; Leitner, J.; Deduytsche, D. Mechanism of the Intermediary Phase Formation in Ti-20 wt. % Al Mixture during Pressureless Reactive Sintering. Materials 2019, 12, 2171. https://doi.org/10.3390/ma12132171

AMA Style

Školáková A, Salvetr P, Novák P, Leitner J, Deduytsche D. Mechanism of the Intermediary Phase Formation in Ti-20 wt. % Al Mixture during Pressureless Reactive Sintering. Materials. 2019; 12(13):2171. https://doi.org/10.3390/ma12132171

Chicago/Turabian Style

Školáková, Andrea, Pavel Salvetr, Pavel Novák, Jindřich Leitner, and Davy Deduytsche. 2019. "Mechanism of the Intermediary Phase Formation in Ti-20 wt. % Al Mixture during Pressureless Reactive Sintering" Materials 12, no. 13: 2171. https://doi.org/10.3390/ma12132171

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