Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy

doi:10.1016/j.jmst.2023.02.002

IMECH-IR > 非线性力学国家重点实验室

	Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy
	Cao FH(曹富华); Chen Y(陈艳); Wang HY(汪海英); Dai LH(戴兰宏)
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2023-08-01
卷号	153 页码:228-241
ISSN	1005-0302
摘要	Grain boundary (GB) fracture is arguably one of the most important reasons for the catastrophic failure of ductile polycrystalline materials. It is of interest to explore the role of chemical distribution on GB defor mation and fracture, as GB segregation becomes a key strategy for tailoring GB properties. Here we report that the inhomogeneous chemical distribution effectively inhibits GB fracture in a model CoCrNi medium entropy alloy compared to a so called 'average atom' sample. Atomic deformation kinematics combined with electronic behavior analysis reveals that the strong charge redistribution ability in chemical disor dered CrCoNi GBs enhances shear deformation and thus prevents GB crack formation and propagation. Inspects on the GBs with different chemical components and chemical distributions suggest that not only disordered chemical distribution but also sufficient harmonic elements with large electronic flexibility contribute to improving the GB fracture resistance. This study provides new insight into the influence mechanism of GB chemistry on fracture behavior, and yields a systematic strategy and criterion, from the atoms and electrons level, forward in the design of high performance materials with enhanced GB fracture resistance.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Fracture Chemical inhomogeneity Grain boundary Medium entropy alloy
DOI	10.1016/j.jmst.2023.02.002
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000955589200001
WOS研究方向	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science ; Metallurgy & Metallurgical Engineering
项目资助者	National Natural Science Foundation of China (NSFC) [12102433, U2241285, 11972346, U2141204] ; NSFC Basic Science Center Program for Multi scale Problems in Nonlinear Mechanics [11988102] ; Key Research Program of the Chinese Academy of Sciences [ZDRW CN 2021 2 3]
论文分区	一类
力学所作者排名	1
RpAuthor	Chen, Y ; Dai, LH (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. ; Chen, Y ; Dai, LH (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China. ; Dai, LH (corresponding author), Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China.
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/91853
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China 3.Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cao FH,Chen Y,Wang HY,et al. Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2023,153:228-241.
APA	曹富华,陈艳,汪海英,&戴兰宏.(2023).Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,153,228-241.
MLA	曹富华,et al."Chemical inhomogeneity inhibits grain boundary fracture: A comparative study in CrCoNi medium entropy alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 153(2023):228-241.

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