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

• 作者: Si-Chun Luo Wei-Ming Guo Yu-Zhang Zhou Kevin Plucknett Hua-Tay Lin
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（35）
• 页码范围: 99-103
• 页数: 5页
• 语种: 英文

摘要

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.