High-temperature toughening in ternary medium-entropy (Ta1/3Ti1/3Zr1/3)C carbide consolidated using spark-plasma sintering
| Autor: | Oleg Vasylkiv, Yoshio Sakka, Dmytro Demirskyi, Takuya Suzuki, Toshiyuki Nishimura, Kyosuke Yoshimi |
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| Rok vydání: | 2020 |
| Předmět: |
Toughness
Materials science Clay industries. Ceramics. Glass Spark plasma sintering 02 engineering and technology 01 natural sciences Carbide chemistry.chemical_compound Fracture toughness Flexural strength 0103 physical sciences high-entropy ceramics high-temperature materials Composite material tantalum carbide 010302 applied physics toughness 021001 nanoscience & nanotechnology Toughening TP785-869 chemistry flexural strength Ceramics and Composites 0210 nano-technology Ternary operation Tantalum carbide |
| Zdroj: | Journal of Asian Ceramic Societies, Vol 8, Iss 4, Pp 1262-1270 (2020) |
| ISSN: | 2187-0764 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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