Abstract
A dual phase high-entropy (Hf,Nb,Ta,Ti,Zr)C–(Hf,Nb,Ta,Ti,Zr)B2 ultra-high temperature ceramic was synthesized using a single step boro-carbothermal reduction route. The synthesized powder was densified by spark plasma sintering at 2000°C, resulting in complete solid solution formation and a relative density of ≈99%. The dual phase ceramic was 43 vol% high-entropy carbide and 57 vol% high-entropy boride. The grain sizes were 0.85 ± 0.34 µm for the carbide and 0.87 ± 0.33 µm for the boride with minimal residual oxide (0.2 vol%) detected in the microstructure. The resulting composition had a higher microhardness than the individual boride and carbide ceramics across the range of testing loads with maximum hardness of 47.5 ± 4 GPa at a load of 0.49N. The high hardness is attributed to the minimum residual oxide, submicron grains, favorable carbide-to-boride ratio, homogeneous metal distribution within the phases, uniform microstructure, and synergistic dual phase hardening.
Recommended Citation
R. Hassan et al., "Synergistic Hardening in a Dual Phase High-Entropy (Hf,Nb,Ta,Ti,Zr)c–(Hf,Nb,Ta,Ti,Zr)b2 Ultra-High Temperature Ceramic," Journal of the American Ceramic Society, Wiley, Jan 2024.
The definitive version is available at https://doi.org/10.1111/jace.20203
Department(s)
Materials Science and Engineering
Publication Status
Full Access
Keywords and Phrases
carbothermal reduction; dual-phase high-entropy ceramics; hardness; spark plasma sintering
International Standard Serial Number (ISSN)
1551-2916; 0002-7820
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Wiley, All rights reserved.
Publication Date
01 Jan 2024
