Textured and toughened high-entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C-SiCw ceramics  

作　　者：Si-Chun Luo Wei-Ming Guo Yu-Zhang Zhou Kevin Plucknett Hua-Tay Lin 

机构地区：[1]School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]College of Mechanical and Electronic Engineering,Pingxiang University,Pingxiang,337000,China [3]Department of Process Engineering and Applied Science,Dalhousie University,Halifax B3J 1Z1,Canada

出　　处：《Journal of Materials Science & Technology》2021年第35期99-103,共5页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51832002,51402055,51602060,U1401247);the Science and Technology Program of Guangzhou(No.201704030095)。

摘　　要：High-entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C ceramics,with different contents(0,5,10,and 20 vol.%)of Si C whiskers(SiCw),were fabricated by spark plasma sintering using raw powders synthesized via carbothermal reduction.The application of a uniaxial compaction force led to texture development of the SiCw within the(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C matrix.Fracture toughness increased with the increase in SiCw content,while Vickers hardness remains almost unchanged.The toughness of(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C-20 vol.%SiCw ceramics reached 4.3±0.3 MPa m^(1/2),which was approximately 43%higher than that of the monolithic(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C ceramic(3.0±0.2 MPa m1/2).The main toughening mechanisms were attributed to crack deflection,whisker debonding,and whisker pullout.

关 键 词：High-entropy carbide ceramics Silican carbide whiskers Microstructure Mechanical properties Toughening mechanism 

分 类 号：TQ174.7[化学工程—陶瓷工业]