High-temperature flexural strength performance of ternary high-entropy carbide consolidated via spark plasma sintering of TaC, ZrC and NbC

D. Demirskyi; H. Borodianska; T.S. Suzuki; Y. Sakka; K. Yoshimi; O. Vasylkiv

doi:10.1016/j.scriptamat.2019.01.024

論文 High-temperature flexural strength performance of ternary high-entropy carbide consolidated via spark plasma sintering of TaC, ZrC and NbC

D. Demirskyi (National Institute for Materials Science) ; H. Borodianska ; T.S. Suzuki ; Y. Sakka ; K. Yoshimi ; O. Vasylkiv

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D. Demirskyi, H. Borodianska, T.S. Suzuki, Y. Sakka, K. Yoshimi, O. Vasylkiv. High-temperature flexural strength performance of ternary high-entropy carbide consolidated via spark plasma sintering of TaC, ZrC and NbC. Scripta Materialia. 2019, 164 (), 12-16. https://doi.org/10.1016/j.scriptamat.2019.01.024

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The solid solution formation and consolidation of the (Ta,Zr,Nb)C single-phase ceramic made from commercial TaC, ZrC and NbC powders prepared by spark plasma sintering at the temperature of 1920 °C was investigated. Phase analysis and lattice parameter measurements by X-ray diffraction showed multi-stage formation of the single-phase high-entropy-type carbide with the lattice parameter of 4.535 Å. The flexural strength and fracture toughness at room temperature were 460±24 MPa and 2.9MPam1/2, respectively. With an increase in temperature, the flexural strength showed an increase up to 1600 °C to 496 ± 44 MPa, then decreased after 1800 °C to 366 ± 46 MPa.

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