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Influence of equiatomic Zr/(Ti,Nb)substitution on microstructure and ultra-high strength of(Ti,Zr,Nb)C medium-entropy ceramics at 1900℃

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Journal of Advanced Ceramics 2022年第9期11卷 1457-1465页

作者： Qingqing YANG Xingang WANG Weichao BAO Ping WU Xiaofei WANG Xiaojie GUO Cheng ZHANG Guojun ZHANG Danyu JIANG State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418China Institute of Functional Materials Donghua UniversityShanghai 201620China

High-temperature mechanical properties of medium-entropy carbide ceramics have attracted significant *** the microstructure is an effective way to improve these high-temperature mechanical properties,which can be affected by the evolution of the enthalpy and entropy,as well as by lattice distortion and sluggish *** this study,the effects of equiatomic Zr/(Ti,Nb)substitution(Zr content of 10-40 at%)on the microstructure and high-temperature strength of(Ti,Zr,Nb)C medium-entropy ceramics were *** grain size of the(Ti,Zr,Nb)C medium-entropy ceramics was refined from 9.4±3.7 to 1.1±0.4μm with an increase in the Zr content from 10.0 to 33.3 at%.A further increase in the Zr content to 40 at%resulted in a slight increase in the grain *** 1900℃,the(Ti,Zr,Nb)C medium-entropy ceramics with the Zr contents of 33.3 and 40 at%exhibited ultra-high flexural strengths of 875±43 and 843±71 MPa,respectively,which were higher than those of the transition metal carbides previously reported under similar ***,relatively smooth grain boundaries,which were detected at a test temperature of 1000℃,transformed into curved and serrated boundaries as the temperature increased to 1900℃,which may be considered the primary reason for the improved high-temperature flexural *** associated mechanism was analyzed and discussed in detail.

关键词： medium entropy mechanical property ultra-high temperature ceramics(UHTCs) nonequimolar compositions curved and serrated grain boundaries

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