Abstract
The intermediate stage densification kinetics of (Hf, Nb, Ta, Ti, Zr) B2 and (Hf, Nb, Ta, Ti, Zr) C were studied using a Coble creep rate model. (Hf, Nb, Ta, Ti, Zr) B2 was synthesized by boro/carbothermal reduction and (Hf, Nb, Ta, Ti, Zr) C was synthesized by carbothermal reduction. Both ceramics were densified by spark plasma sintering at 1700–1850°C. The activation energies for densification were 575 ± 53 kJ/mol for the high-entropy boride and 646 ± 4 kJ/mol for the high-entropy carbide. The densification mechanisms were grain boundary diffusion for the high-entropy boride and lattice diffusion for the high-entropy carbide. Dissolution of Nb into the high-entropy phase was determined to be the rate limiting mechanism for densification of both the carbide and the boride.
Recommended Citation
S. M. Smith et al., "Intermediate Stage Densification Kinetics of High-entropy Ceramics during Spark Plasma Sintering," Journal of the European Ceramic Society, vol. 45, no. 5, article no. 117136, Elsevier, May 2025.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2024.117136
Department(s)
Materials Science and Engineering
Keywords and Phrases
Borides; Carbides; Densification kinetics; High entropy; SPS
International Standard Serial Number (ISSN)
1873-619X; 0955-2219
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Publication Date
01 May 2025
Comments
Office of Naval Research, Grant N00014-21-1-2515