The effect of submicron grain size on thermal stability and mechanical properties of high‐entropy carbide ceramics

By Fei Wang, Xiang Zhang, Xueliang Yan, Yongfeng Lu, M. Nastasi, Yan Chen, B. Cui. Journal of The American Ceramic Society, 2020

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Compared to the extensively studied metallic high-entropy alloys (HEAs), high-entropy ceramics including oxide, borides, and carbides are less investigated. They are characterized by multiple metal elements in equal atomic concentrations in the cation position, while a nonmetal element (such as O, B, or C) occupies the anion position. It is noted, however, that the chemical bonding in high-entropy carbide ceramics is primary covalent with secondary metallic bonding.1,2 High-entropy ceramic materials have shown special physical properties. For example, the recent research on high-entropy carbides (HECs)3-5 has revealed low thermal conductivity,6 high hardness,7-9 and an improved oxidation resistance.10-12 These properties make HECs as promising candidate materials for high-temperature applications such Received: 24 October 2019 | Revised: 5 February 2020 | Accepted: 2 March 2020 DOI: 10.1111/jace.17103

Subfields: Aerospace Engineering, Mechanical Engineering

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