The new complex high‐entropy metal boron carbonitride: Microstructure and mechanical properties
Jingyi Guan, Yuchen Liu, Daxin Li, Zhihua Yang, Shaohua Qin, Dechang Jia, Yu Zhou
Abstract
Abstract 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.