A novel in-situ exothermic assisted sintering high entropy Al2O3/ (NbTaMoW)C composites: Microstructure and mechanical properties

doi:https://doi.org/10.1016/j.compositesb.2021.108681

LICP OpenIR > 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心

	A novel in-situ exothermic assisted sintering high entropy Al2O3/ (NbTaMoW)C composites: Microstructure and mechanical properties
Department	中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心
	Liu DQ(刘第强)1,2; Zhang AJ(张爱军)1 ; Jia JG(贾建刚)3; Han JS(韩杰胜); Zhang JY(张俊彦)1,2 ; Meng JH(孟军虎)1,2
The second department	金属陶瓷耐磨材料与先进制造课题组
	2021
Source Publication	Composites Part B
Volume	212 Issue:2021 Pages:108681
Abstract	In this paper, we have designed a Al2O3/(NbTaMoW)C composite by in-situ exothermic reaction, which opened a new field to explore HEC matrix composites. The Al2O3/(NbTaMoW)C composite was synthesized at 1600 ◦C using Nb, Ta, W, MoO3, Al and graphite powders as raw materials, and the thermite of Al + MoO3 as heat source provides additional energy for the formation of composites. As-prepared composites with relative density 98.5% only exhibited two phases including a high entropy carbide of (NbTaMoW)C and Al2O3 phases, and Al2O3 randomly distributed within high entropy matrix. Phase boundary between (NbTaMoW)C and Al2O3 was a noncoherent interface, resulting in a moderate interfacial bonding strength which was beneficial to both flexural strength and fracture toughness. Moreover, Al2O3 and HEC form an interesting interlocking structure and a grain size varies from 1 μm to 10 μm due to the inhomogeneous temperature distribution introduced by the in-situ exothermic heat. By taking advantages of these special structures, the composites exhibited significantly enhanced mechanical properties compared to (NbTaMoW)C. The flexural strength of composites was up to 530 MPa, and the fracture toughness was 4.5 MPa m1/2. The main strengthening mechanism is second phase strengthening and the presence interlocking structure releases stress intensity at crack tip.
Keyword	High entropy carbides Exothermic reaction In-situ synthesis Microstructure Interlocking structure
MOST Discipline Catalogue	工学::材料科学与工程（可授工学、理学学位）
DOI	https://doi.org/10.1016/j.compositesb.2021.108681
URL	查看原文
If	9.078
Language	英语
compositor	第一作者单位
Citation statistics
Document Type	期刊论文
Identifier	http://ir.licp.cn/handle/362003/27901
Collection	中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心
Corresponding Author	Jia JG(贾建刚); Meng JH(孟军虎)
Affiliation	1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics 2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences 3.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology
Recommended Citation GB/T 7714	Liu DQ,Zhang AJ,Jia JG,et al. A novel in-situ exothermic assisted sintering high entropy Al2O3/ (NbTaMoW)C composites: Microstructure and mechanical properties[J]. Composites Part B,2021,212(2021):108681.
APA	Liu DQ,Zhang AJ,Jia JG,Han JS,Zhang JY,&Meng JH.(2021).A novel in-situ exothermic assisted sintering high entropy Al2O3/ (NbTaMoW)C composites: Microstructure and mechanical properties.Composites Part B,212(2021),108681.
MLA	Liu DQ,et al."A novel in-situ exothermic assisted sintering high entropy Al2O3/ (NbTaMoW)C composites: Microstructure and mechanical properties".Composites Part B 212.2021(2021):108681.

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