Abstract
Transition metal diborides with core–shell microstructures have demonstrated excellent mechanical properties at elevated temperatures. Previous studies concluded that core–shell microstructures were formed by liquid-assisted mass transport mechanisms, but in this study, we propose a solid-state formation mechanism for core-shell microstructures in (Zr,Ta)B2 ceramics produced by reaction hot pressing and in ZrB2-TaB2 diffusion couples. Diffusion couple experiments demonstrated that core–shell microstructures developed as a result of Ta diffusion along ZrB2 grain boundaries, which occurred concurrently with lattice diffusion of Ta into ZrB2. These findings suggest that with optimization of batching and processing parameters, core–shell diboride materials may be formed through solid-state processes rather than liquid-assisted processes, which could assist in raising the upper temperature limits of use for these materials.
Recommended Citation
A. N. Dorner et al., "Solid-State Formation Mechanisms of Core–shell Microstructures in (Zr,Ta)B2 Ceramics," Journal of the American Ceramic Society, vol. 105, no. 5, pp. 3147 - 3152, Wiley, May 2022.
The definitive version is available at https://doi.org/10.1111/jace.18363
Department(s)
Materials Science and Engineering
Keywords and Phrases
core–shell microstructure; interdiffusion; solid solution; tantalum diboride; zirconium diboride
International Standard Serial Number (ISSN)
1551-2916; 0002-7820
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2023 Wiley, All rights reserved.
Publication Date
01 May 2022
Comments
Honeywell Federal Manufacturing and Technologies, Grant DE-NA0002839