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The new complex high‐entropy metal boron carbonitride: Microstructure and mechanical properties
Author(s) -
Guan Jingyi,
Liu Yuchen,
Li Daxin,
Yang Zhihua,
Qin Shaohua,
Jia Dechang,
Zhou Yu
Publication year - 2022
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.18577
Subject(s) - materials science , sintering , microstructure , fracture toughness , vickers hardness test , ceramic , flexural strength , ternary operation , amorphous solid , spark plasma sintering , composite material , metallurgy , amorphous metal , crystallography , chemistry , alloy , computer science , programming language
In this contribution, the ternary BCN anion systems of high‐entropy ceramics (HEC) are consolidated by hot‐pressing sintering and the impacts of sintering temperature and the content of amorphous BCN addition on microstructural evolution and mechanical performance were evaluated. Results confirmed that high‐entropy, oxide, and BN(C) phases were precipitated for (Ta 0.2 Nb 0.2 Zr 0.2 Hf 0.2 Ti 0.2 )(B, C, N) ceramics after sintering at 1900°C. With the decrease of BCN addition, a new phase of MiB 2 (Mi representing the metal atoms) occurred. The Vickers hardness, bending strength, elastic modulus, and fracture toughness of the optimized bulk HECs were investigated, obtained at 24.5 ± 2.3 GPa, 522.0 ± 2.6 MPa, 478.9 ± 11.1 GPa, and 5.36 ± 0.56 MPa m 1/2 , respectively.