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

doi:10.1016/j.compositesb.2021.108681

	A novel in-situ exothermic assisted sintering high entropy Al2O3/(NbTaMoW)C composites: Microstructure and mechanical properties
	Liu, Diqiang 1,2; Zhang, Aijun 1; Jia, Jiangang3 ; Han, Jiesheng 1; Zhang, Junyan 1; Meng, Junhu 1
	2021-05-01
发表期刊	Composites Part B: Engineering
ISSN	1359-8368
卷号	212
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. © 2021 Elsevier Ltd
关键词	Alumina Aluminum Aluminum oxide Bending strength Carbides Composite structures Crack tips Entropy Fracture toughness Molybdenum oxide Sintering Tantalum compounds Interfacial bonding strength Interlocking structure Matrix composite Microstructure and mechanical properties Randomly distributed Second phase strengthening Special structure Strengthening mechanisms
DOI	10.1016/j.compositesb.2021.108681
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Multidisciplinary ; Materials Science, Composites
WOS记录号	WOS:000632889600013
出版者	Elsevier Ltd
EI入藏号	20210709916821
EI主题词	Niobium compounds
EI分类号	408.2 Structural Members and Shapes ; 541.1 Aluminum ; 641.1 Thermodynamics ; 804 Chemical Products Generally ; 804.2 Inorganic Compounds
来源库	WOS
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/147689
专题	材料科学与工程学院
通讯作者	Zhang, Aijun; Meng, Junhu
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, Key Lab Sci & Technol Wear & Protect Mat, Lanzhou 730000, Peoples R China; 2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; 3.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Liu, Diqiang,Zhang, Aijun,Jia, Jiangang,et al. A novel in-situ exothermic assisted sintering high entropy Al2O3/(NbTaMoW)C composites: Microstructure and mechanical properties[J]. Composites Part B: Engineering,2021,212.
APA	Liu, Diqiang,Zhang, Aijun,Jia, Jiangang,Han, Jiesheng,Zhang, Junyan,&Meng, Junhu.(2021).A novel in-situ exothermic assisted sintering high entropy Al2O3/(NbTaMoW)C composites: Microstructure and mechanical properties.Composites Part B: Engineering,212.
MLA	Liu, Diqiang,et al."A novel in-situ exothermic assisted sintering high entropy Al2O3/(NbTaMoW)C composites: Microstructure and mechanical properties".Composites Part B: Engineering 212(2021).