Textured and toughened high-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C-SiCw ceramics

Si-Chun Luo ¹Wei-Ming Guo ²Yu-Zhang Zhou ²Kevin Plucknett ³Hua-Tay Lin²

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作者信息

1. School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;College of Mechanical and Electronic Engineering,Pingxiang University,Pingxiang,337000,China
2. School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China
3. School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;Department of Process Engineering and Applied Science,Dalhousie University,Halifax B3J 1Z1,Canada
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Abstract

High-entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C ceramics,with different contents (0,5,10,and 20 vol.％) of SiC whiskers (SiCw),were fabricated by spark plasma sintering using raw powders synthesized via car-bothermal reduction.The application of a uniaxial compaction force led to texture development of the SiCw within the (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C matrix.Fracture toughness increased with the increase in SiCw content,while Vickers hardness remains almost unchanged.The toughness of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C-20 vol.％ SiCw ceramics reached 4.3 ± 0.3 MPa m1/2,which was approximately 43％ higher than that of the monolithic (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C ceramic (3.0 ± 0.2 MPa m1/2).The main toughening mechanisms were attributed to crack deflection,whisker debonding,and whisker pullout.

Key words

High-entropy carbide ceramics/Silican carbide whiskers/Microstructure/Mechanical properties/Toughening mechanism

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基金项目

National Natural Science Foundation of China(51832002)

National Natural Science Foundation of China(51402055)

National Natural Science Foundation of China(51602060)

National Natural Science Foundation of China(U1401247)

Science and Technology Program of Guangzhou(201704030095)

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量24

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