Structural and phase characteristics of Ti-Al-Si powder materials under different synthesis conditions | Izvestiya vuzov. Fizika. 2021. № 10. DOI: 10.17223/00213411/64/10/117

Structural and phase characteristics of Ti-Al-Si powder materials under different synthesis conditions

The structure and phase composition of Ti-Al-Si powder composites obtained under different conditions, including vacuum sintering and self-propagating high-temperature synthesis (SHS), have been investigated. For the study, certain ratios of the reacting components were selected, assuming the formation of two-phase composites in two versions: TiAl₃ + Ti₅Si₃ and Ti₃Al + Ti₅Si₃. Vacuum sintering of Ti-Al-Si powder mixtures in the investigated component ratios showed that a two-phase structure is predominantly formed, but the quantitative ratio of the formed phases can differ significantly from the target compositions. Noticeable distortions of the lattice parameters of the observed phases are noted. Analysis of the results of synthesis under the conditions of wave combustion of Ti-Al-Si composites showed that the synthesis reaction was completed completely only in the composition with the calculated phase composition TiAl₃ + Ti₅Si₃. This made it possible to further prepare a powder from the synthesized product. The work also analyzed the behavior of the synthesized powder product based on the phase composition TiAl₃ + Ti₅Si₃ during subsequent vacuum sintering of its compacts. It was found that, as a result of sintering compacts of SHS powder based on the TiAl₃ + Ti₅Si₃ composite at a temperature of 1300 °C, its qualitative phase composition is retained against the background of a slight change in the quantitative phase ratio. In this case, there is a noticeable compaction of the compacts and a decrease in residual porosity.

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Keywords

titanium aluminide, titanium silicide, vacuum sintering, self-propagating high-temperature synthesis (SHS), microstructure, phase composition

Authors

Name	Organization	E-mail
Korosteleva E.N.	Institute of Strength Physics and Materials Science of SB RAS	elenak@ispms.tsc.ru
Korzhova V.V.	Institute of Strength Physics and Materials Science of SB RAS	vicvic5@mail.ru

Всего: 2

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