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26. Fabrication and characterization of medium‐entropy carbide ceramics in low temperature sintering.

Author

Zou, Qin, Li, Zhuang, Li, Yanguo, Li, Shuang, Gu, Haotian, He, Wenquan, and Luo, Yongan

Subjects
CERAMICS, LOW temperatures, MECHANICAL behavior of materials, FACE centered cubic structure, SOLUTION strengthening, SCANNING electron microscopes
Abstract

The medium‐entropy carbide (W,Ti,V)C0.8 ceramics were prepared by sparking plasma sintering at temperatures between 1400 and 1700°C. The effects of sintering temperature on the microstructure and mechanical properties of the medium‐entropy carbide (W,Ti,V)C0.8 ceramics were investigated. X‐ray diffraction, scanning electron microscope, and energy dispersive spectrometer were used to confirm the formation of single‐phase face‐centered cubic (FCC) solid solution of the medium‐entropy carbide (W,Ti,V)C0.8 ceramics prepared at a sintering temperature of 1600°C. It was found that the mechanical properties of the material were improved by solid solution strengthening during the formation of single‐phase FCC solid solution, and the best overall performance of the medium‐entropy carbide (W,Ti,V)C0.8 ceramics was achieved at 1600°C, when the hardness value was 22.3 ± 1.8 GPa, the fracture toughness was 5.7 ± 0.8 MPa·m1/2, the flexural strength was 605 ± 4 MPa, and the compressive strength was 1.84 GPa. Most importantly, the addition of TiC0.4 promoted the diffusion among the elements of the medium‐entropy carbide (W,Ti,V)C0.8 ceramics, which contributed to the formation of single‐phase FCC solid solution and significantly reduced the sintering temperature of the medium‐entropy carbide (W,Ti,V)C0.8 ceramics due to the effect of vacancies. This study provides a new idea for the preparation of medium‐entropy carbide ceramics. [ABSTRACT FROM AUTHOR]

Published
2023
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28. Microstructure and mechanical properties of CoCrNiCuXhigh-entropy alloys fabricated by spark plasma sintering

Author

Luo, Wenqi, Zou, Qin, Li, Yanguo, Ye, Xihui, Yang, Xiaowei, Song, Jintao, and Luo, Yongan

Abstract

CoCrNiCuX(X= Mn, MnFe, FeAl) high-entropy alloys were prepared by mechanical alloying and spark plasma sintering. The relationship between microstructural and mechanical properties of CoCrNiCuXpowders and bulks was investigated. The effects of the addition and substitution of elements on crystal structure transition, microstructural evolution, and mechanical properties were assessed. The results indicated that, with the addition of Fe, the crystal structure of the alloys was transformed from fcc phase to a mix of fcc and bcc phases. By substituting Mn with Fe and Al, the formation of bcc phase was promoted, which caused precipitation hardening that significantly improved the hardness and compression strength of the investigated high-entropy alloys.

Published
2022
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