High-Entropy Ultra-High-Temperature Borides and Carbides: A New Class of Materials for Extreme Environments
Herein, we critically evaluate computational and experimental studies in the emerging field of high-entropy ultra-high-temperature ceramics. High-entropy ultra-high-temperature ceramics are candidates for use in extreme environments that include temperatures over 2,000°C, heat fluxes of hundreds of watts per square centimeter, or irradiation from neutrons with energies of several megaelectron volts. Computational studies have been used to predict the ability to synthesize stable high-entropy materials as well as the resulting properties but face challenges such as the number and complexity of unique bonding environments that are possible for these compositionally complex compounds. Experimental studies have synthesized and densified a large number of different high-entropy borides and carbides, but no systematic studies of composition-structure-property relationships have been completed. Overall, this emerging field presents a number of exciting research challenges and numerous opportunities for future studies.
L. Feng et al., "High-Entropy Ultra-High-Temperature Borides and Carbides: A New Class of Materials for Extreme Environments," Annual Review of Materials Research, vol. 51, pp. 165 - 185, Annual Reviews, Jul 2021.
The definitive version is available at https://doi.org/10.1146/annurev-matsci-080819-121217
Materials Science and Engineering
Keywords and Phrases
Entropy stabilization; High-entropy borides; High-entropy carbides; High-entropy ceramics; Ultra-high-temperature ceramics
International Standard Serial Number (ISSN)
Article - Journal
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26 Jul 2021