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Abstract
The concept of multi-principal component has created promising opportunities for the development of novel high-entropy ceramics for extreme environments encountered in advanced turbine engines, nuclear reactors, and hypersonic vehicles, as it expands the compositional space of ceramic materials with tailored properties within a single-phase solid solution. The unique physical properties of some high-entropy carbides and borides, such as higher hardness, high-temperature strength, lower thermal conductivity, and improved irradiation resistance than the constitute ceramics, have been observed. These promising properties may be attributed to the compositional complexity, atomic-level disorder, lattice distortion, and other fundamental processes related to defect formation and phonon scattering. This manuscript serves as a critical review of the recent progress in high-entropy carbides and borides, focusing on synthesis and evaluations of their performance in extreme high-temperature, irradiation, and gaseous environments.
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1 Department of Mechanical & Materials Engineering, University of Nebraska–Lincoln , Lincoln, NE 68588, United States of America
2 National Research Council of Italy—Institute of Science, Technology and Sustainability for Ceramics , I-48018 Faenza, Italy
3 Department of Mechanical & Materials Engineering, University of Nebraska–Lincoln , Lincoln, NE 68588, United States of America; Nebraska Center for Materials and Nanoscience, University of Nebraska–Lincoln , Lincoln, NE 68588, United States of America