Combustion peculiarities in the 2Co–Ti–Al system and properties of half-metallic ferromagnetic Heusler alloy Co2TiAl

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Abstract

Combustion in the 2Co–Ti–Al system was observed by high-speed video recording. It is established that combustion occurs in the frontal mode, and the process parameters are determined. The maximum rate of the combustion temperature increase from the moment of initiation to the maximum value reached 2.7 · 104 K/s. The front propagation velocity calculated from the video recording was 9.4 cm/s. A micro-hotspot mode of combustion of the reaction composition was found. The temperature dependences of the electrical resistivity and magnetic moment of the single-phase Co2TiAl product synthesized in the combustion mode have been measured. For the synthesized Co2TiAl sample, the Curie temperature is Tc = 120 ± 5 K, and the electrical resistivity at room temperature is 1.35 μOhm · m. It is shown that the electrical and magnetic properties of the Co2TiAl alloy obtained in the combustion mode are similar to those of alloys obtained by arc melting.

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About the authors

M. L. Busurina

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian academy of sciences

Author for correspondence.
Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka

A. E. Sytschev

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian academy of sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka

S. G. Vadchenko

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian academy of sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka

A. V. Karpov

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian academy of sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka

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Supplementary files

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2. Fig. 1. Video frames of the SHS process of a sample of the 2Co + Ti + Al composition in a vacuum, obtained using a high-speed video camera.

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3. Fig. 2. Thermogram of the SHS process of the reaction mixture of the composition 2Co+Ti+Al in a vacuum.

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4. Fig. 3. Micro-foci on the surface of the combustion front of the 2Co+Ti+Al composition.

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5. Fig. 4. Photo of the sample before (1) and after synthesis (2).

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6. Fig. 5. Photograph of the microstructure of the surface of a section of a sample of combustion products of a 2Co−Ti−Al mixture and the results of EDA (wt.%).

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7. Fig. 6. Temperature dependence of the magnetic moment M of the synthesized Co2TiAl sample cooled in zero magnetic field and a magnetic field H = 10 kA/m.

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8. Fig. 7. a – Temperature dependence of specific electrical resistance; b – dependence of ln{σ(T)−σ0} on T−1/4 for the synthesized Co2TiAl sample.

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