High-Entropy Ultra-High-Temperature Borides and Carbides: A New Class of Materials for Extreme Environments

Abstract

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.

Department(s)

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)

1531-7331; 1545-4118

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2021 Annual Reviews, All rights reserved.

Publication Date

26 Jul 2021

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