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

文献类型：期刊论文

作者Liu DQ(刘第强)2,3; Zhang AJ(张爱军)3; Jia JG(贾建刚)1; Han JS(韩杰胜); Zhang JY(张俊彦)2,3; Meng JH(孟军虎)2,3
刊名Composites Part B
出版日期2021
卷号212期号:2021页码:108681
关键词High entropy carbides Exothermic reaction In-situ synthesis Microstructure Interlocking structure
DOIhttps://doi.org/10.1016/j.compositesb.2021.108681
英文摘要

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.
 

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语种英语
源URL[http://ir.licp.cn/handle/362003/27901]  
专题兰州化学物理研究所_先进润滑与防护材料研究发展中心
通讯作者Jia JG(贾建刚); Meng JH(孟军虎)
作者单位1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology
2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences
3.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics
推荐引用方式
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.

入库方式： OAI收割

来源：兰州化学物理研究所

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