Automatic Welding, 2022, №11



2022 №11 (07)

DOI of Article 10.37434/as2022.11.08

2022 №11 (01)

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Avtomaticheskaya Svarka (Automatic Welding), #11, 2022, pp. 52-56

Effect of preliminary activation of TiAl powder on the process of mechanochemical synthesis of (Fe, Ti)₃Al intermetallics

Yu.S. Borysov¹, O.M. Burlachenko¹, N.V. Vigilianska¹, C. Senderowski²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²University of Warmia and Mazury. 2 Michała Oczapowskiego Str., 10719, Olsztyn, Poland. E-mail: cezary.senderowski@pw.edu.pl

The effect of mechanical activation of tial powder on the structural and phase transformations in mechanochemical synthesis of the powder mixture of the composition 60.8Fe + 39.2TiAl, intended to produce Fe3Al intermetallics, alloyed with titanium was studied. Using a semi-empirical Miedema’s model, the changes of Gibbs energy for the binary systems Ti-Al, Fe-Ti and Fe-Al were calculated. The results showed that the driving force for the formation of intermetallic phases for all the binary systems is higher as compared to the formation of solid solutions and amorphous phases. A range of compositions was established, in which the formation of amorphous phases in the binary systems Ti-Al and Fe-Al is possible. Carrying out the mechanical activation of TiAl intermetallic powder in a high-energy planetary mill allowed reducing the size of a coherent scattering from 280 to 9 nm with a partial amorphization. The formation of particles with a homogeneous microstructure consisting of intermetallic phase (Fe, Ti)3Al and Lavhes’s phases – Fe2Ti was established in the process of mechanchemical synthesis of a powder mixture 60.8Fe+39.2 TiAl when using nanostructural TiAl powder. The change in the area of coherent scattering of powders of 60.8Fe+39.2TiAl mixture was evaluated, obtained by the method of mechanochemical synthesis, and it was established that interaction of a nanostructural powder TiAl with Fe begins to occur when the size of the coherent scattering area is <70 nm. The resulting product has an amorphous-nanocrystalline structure with the size of the coherent scattering area of <15 nm. The use of the developed powder in thermal spraying technologies will allow producing coatings based on Fe3Al intermetallics with a nanocrystalline structure, a higher modulus of elasticity and ductility. 13 Ref., 3 Tabl., 5 Fig.
Keywords: mechanochemical synthesis, mechanical activation, titanium aluminide, semi-empirical Miedema’s model, nanocrystalline structure, amorphous phase


Received: 25.07.2022

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