We are pleased to showcase another one significant accomplishment by our esteemed partners, the A.B. Nalbandyan Institute (NAL), achieved within the BEETHOVEN project framework.
Their latest research article, “Self-Propagating High-Temperature Synthesis of High-Entropy Composite in a Ti–Cr–Mn–Co–Ni–Al–C System“, has been published in the Ceramics Journal.
Authored by: Alina Zurnachyan, Abraam Ginosyan, Roman Ivanov, Irina Hussainova and Sofiya Aydinyan, the paper can be assessed via the following DOI: https://doi.org/10.3390/ceramics8040137
Below, you will find the abstract of the publication.
Abstract:
High-entropy materials have emerged as promising candidates for high-temperature structural, magnetic, and electrochemical applications due to their unique combination of compositional complexity, thermal stability, and tailored functionality. In this study, selfpropagating high-temperature synthesis (SHS) was employed to fabricate high-entropy composite in a Ti–Cr–Mn–Co–Ni–Al–C multicomponent system with a focus on elucidating the effect of titanium content on the combustion parameters, as well as on the phase and structure formation patterns of the resulting materials. In situ profiling enables evaluating the maximum combustion temperature of 1560 ◦C, combustion wave propagation velocity ranging from 0.22 to 4.3 mm/s depending on titanium content, and heating and cooling rates of 300–2000 ◦C/s and 3 ◦C/s during synthesis. The synthesized powders exhibited a bimodal particle size distribution, with ~90% of particles below 25 µm and a D50 of 5.38 µm. Post-synthesis densification via spark plasma sintering (SPS) at 1250 ◦C under 45 MPa yielded dense bulk samples, which exhibited a high relative density and high Vickers microhardness of 1270 ± 35 HV10 attributed to fine TiC dispersion and secondary carbide formation. Thermogravimetric analysis performed under air flow with a heating rate of 20 ◦C/min showed enhanced thermal stability for both the powder and the sintered bulk. These findings demonstrate the efficacy of SHS for rapid, energy-efficient fabrication of high-entropy composites and underscore the critical role of composition in tailoring their structural and mechanical properties.