In situ reaction synthesis, microstructure and thermomechanical properties of novel medium-entropy (Ti,V,Nb,Ta)2AlC ceramics

doi:10.1016/j.ceramint.2023.03.250

IMR OpenIR

	In situ reaction synthesis, microstructure and thermomechanical properties of novel medium-entropy (Ti,V,Nb,Ta)2AlC ceramics
	Ma, Ke 1; Shi, Xiaoguo 3; He, Guangqi 1,2; Li, Jingjing 1; Xu, Jingjun 1; Zuo, Jun 1; Li, Meishuan 1
通讯作者	Xu, Jingjun(jjxu@imr.ac.cn)
	2023-07-01
发表期刊	CERAMICS INTERNATIONAL
ISSN	0272-8842
卷号	49 期号:13 页码:21206-21212
摘要	High- and medium-entropy (HE and ME) materials have attracted considerable interest in recent years due to the advantages of designable components and tunable structures with modifiable physicochemical performances. Herein, a dense equiatomic quaternary (Ti,V,Nb,Ta)2AlC solid solution, or denoted as a medium-entropy MAX phase, was fabricated by in-situ reaction in hot-pressing sintering process using easily available elemental powders as raw materials. X-ray diffraction with its Rietveld refinement analysis, scanning electron microscope and high-resolution scanning transmission electron microscope equipped with energy-dispersed spectrometer analysis identify the phase composition and crystal structure of the novel ME-M2AlC (Ti,V,Nb,Ta)2AlC phase. Especially, the atomic-resolution HAADF images directly prove the mutual solution of four metallic elements of the ME (Ti,V,Nb,Ta)2AlC phase. Both the flexural strength and Vickers hardness are enhanced compared with the reported individual components, and the strengthening and hardening results largely benefit from solid-solution effect with lattice distortion in structure. The fracture toughness has not been enhanced due to the lack of effective toughening mechanism. Furthermore, the electrical conductivity of ME (Ti,V,Nb,Ta)2AlC ceramic is distinctly decreased as a result of the increasing carrier lattice scattering and point defect scattering, which is caused by severe lattice distortion. Similarly, the scattering effect of solid solutions is also responsible for the lower thermal conductivity. It is worth noting that size disorder parameter (delta size) is a more effective criterion to evaluate the reduced thermal conductivity than the ideal mixing configurational entropy itself. As a result, applying the medium- and high-entropy design to the MAX phases with chemical and structural diversity can provide a large compositional space with corresponding large range of unexpected performances, which is highly anticipated.
关键词	(Ti Nb Ta) 2 AlC phase Multi-elemental solid solution Microstructure characterization Thermomechanical properties
资助者	Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences ; National Natural Science Foundation of China ; major innovation projects of science, education, and industry integration of Qilu University of Technology (Shandong Academy of Science)
DOI	10.1016/j.ceramint.2023.03.250
收录类别	SCI
语种	英语
资助项目	Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences ; National Natural Science Foundation of China[51472048] ; National Natural Science Foundation of China[52071318] ; major innovation projects of science, education, and industry integration of Qilu University of Technology (Shandong Academy of Science)[2022JBZ02-05]
WOS研究方向	Materials Science
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:001010415200001
出版者	ELSEVIER SCI LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/178184
专题	中国科学院金属研究所
通讯作者	Xu, Jingjun
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China 3.Qilu Univ Technol, Shandong Acad Sci, Sch Environm Sci & Engn, Jinan 250353, Peoples R China
推荐引用方式 GB/T 7714	Ma, Ke,Shi, Xiaoguo,He, Guangqi,et al. In situ reaction synthesis, microstructure and thermomechanical properties of novel medium-entropy (Ti,V,Nb,Ta)2AlC ceramics[J]. CERAMICS INTERNATIONAL,2023,49(13):21206-21212.
APA	Ma, Ke.,Shi, Xiaoguo.,He, Guangqi.,Li, Jingjing.,Xu, Jingjun.,...&Li, Meishuan.(2023).In situ reaction synthesis, microstructure and thermomechanical properties of novel medium-entropy (Ti,V,Nb,Ta)2AlC ceramics.CERAMICS INTERNATIONAL,49(13),21206-21212.
MLA	Ma, Ke,et al."In situ reaction synthesis, microstructure and thermomechanical properties of novel medium-entropy (Ti,V,Nb,Ta)2AlC ceramics".CERAMICS INTERNATIONAL 49.13(2023):21206-21212.