High-temperature toughening in ternary medium-entropy (Ta1/3Ti1/3Zr1/3)C carbide consolidated using spark-plasma sintering

D. Demirskyi, T. Nishimura, T. S. Suzuki, Y. Sakka, O. Vasylkiv, K. Yoshimi

Research output: Contribution to journalArticlepeer-review

Abstract

We report for the first time the effect of temperature on the mechanical properties of (Ta1/3Ti1/3Zr1/3)C carbide. Flexural strength and fracture toughness were investigated using the three-point bending technique in argon. Using commercially available carbide powders with an equimolar ratio and performing spark plasma consolidation at 1973°C, we obtained a bulk single-phase medium-entropy carbide ceramic with the lattice parameter a= 4.458 Å. The flexural strength and fracture toughness at room temperature reached on average 700 MPa and 3.2 MPa m1/2, respectively. At 1800°C, local decomposition of the medium-entropy carbide took place as a structure with a local chemical gradient was observed after high-temperature tests, which increased fracture toughness by 30% (to 4.4 MPa m1/2).

Original languageEnglish
Pages (from-to)1262-1270
Number of pages9
JournalJournal of Asian Ceramic Societies
Volume8
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • Tantalum carbide
  • flexural strength
  • high-entropy ceramics
  • high-temperature materials
  • toughness

ASJC Scopus subject areas

  • Ceramics and Composites

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