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The high-toughness mechanism of heterogeneous solid solution HfC-TaC-HfO2 composite ceramics

文献类型：期刊论文

作者Tan, ZY3; Xu GN(徐光楠)2; Peng, YB3; Wen, SY1
刊名COMPOSITES COMMUNICATIONS
出版日期2024-11-01
卷号51页码:6
关键词UHTC Toughening mechanism Solid solution TaC-HfC ceramics
ISSN号2452-2139
DOI10.1016/j.coco.2024.102097
通讯作者Tan, Z. Y.(tanzhenyu@hut.edu.cn)
英文摘要Homogenisation and low-temperature sintering of multicomponent ultra-high temperature ceramics (UHTCs) are crucial technologies for their applications. However, the potential of utilizing the heterogeneous solid solution between UHTCs as a means of toughening has been neglected. The current work proposes a novel inhomogeneous solid solution phase composed of isomorphic HfC and TaC, which is designed to induce additional fracture energy dissipation. This phase is achieved using an ingenious powder screening method combined with the introduction of HfO2 sintering additive. The hardness and fracture toughness of the composite ceramics reached 14.9 +/- 1.3 GPa and 6.5 +/- 0.4 MPa m(1/2), respectively. The toughening mechanism was studied using real two-dimensional structure stress simulation and density functional theory (DFT) calculations. Uneven valence electron concentration results in the ductile to brittle transition of Hf1-xTaxC. Crack deflection and bridging toughening mechanisms originate from the second phase stress of HfO2 particles and the heterogeneous matrix. This discovery will provide a noteworthy research direction for the design of high toughness multicomponent UHTCs.
分类号二类/Q1
WOS关键词HIGH TEMPERATURE CERAMICS ; TRANSITION ; HFC ; TAC
资助项目Natural Science Foundation of Hunan Province of China[2024JJ6204] ; Natural Science Foundation of Hunan Province of China[2023JJ50182]
WOS研究方向Materials Science
语种英语
WOS记录号WOS:001328025400001
资助机构Natural Science Foundation of Hunan Province of China
其他责任者Tan, Z. Y.
源URL[http://dspace.imech.ac.cn/handle/311007/96907]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
3.Hunan Univ Technol, Coll Mat & Adv Mfg, Zhuzhou 412007, Peoples R China;
推荐引用方式
GB/T 7714		 Tan, ZY,Xu GN,Peng, YB,et al. The high-toughness mechanism of heterogeneous solid solution HfC-TaC-HfO2 composite ceramics[J]. COMPOSITES COMMUNICATIONS,2024,51:6.
APA Tan, ZY,徐光楠,Peng, YB,&Wen, SY.(2024).The high-toughness mechanism of heterogeneous solid solution HfC-TaC-HfO2 composite ceramics.COMPOSITES COMMUNICATIONS,51,6.
MLA Tan, ZY,et al."The high-toughness mechanism of heterogeneous solid solution HfC-TaC-HfO2 composite ceramics".COMPOSITES COMMUNICATIONS 51(2024):6.

入库方式： OAI收割

来源：力学研究所

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