Deformation induced hcp nano-lamella and its size effect on the strengthening in a CoCrNi medium-entropy alloy

doi:10.1016/j.jmst.2020.12.017

IMECH-IR > 非线性力学国家重点实验室

	Deformation induced hcp nano-lamella and its size effect on the strengthening in a CoCrNi medium-entropy alloy
	Ma Y(马彦)1,2; Yang MX(杨沐鑫)1 ; Yuan FP(袁福平)1,2 ; Wu XL(武晓雷)1,2
通讯作者	Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-08-20
卷号	82 页码:122-134
ISSN	1005-0302
摘要	Deformation-induced hcp nano-lamellae with various widths and interspacings were observed in the CoCrNi medium-entropy alloy (MEA) under high strain rate and cryogenic temperature in the present study. Higher hardness was found in the cryogenic-deformed samples compared to the room temperature-deformed samples without hcp phase. Then, size effects of embedded hcp nano-lamellae on the tensile behaviors in the fcc CoCrNi MEA were investigated by molecular dynamics simulations. The overall strengthening was found to have two components: phase strengthening and extra interface strengthening, and the interface strengthening was observed to be always stronger than the phase strengthening. Both overall strengthening and interface strengthening were found to increase with increasing width and decreasing interspacing of embedded hcp nano-lamellae. The samples with small spaced hcp nano-lamellae are even stronger than the pure hard hcp phase due to the extra interface strengthening. The samples with larger width of embedded hcp nano-lamellae can provide stronger resistance for dislocation slip and transmission. Nanotwins were observed to be formed in the embedded hcp nano-lamellae. Higher density of phase boundaries and newly formed twin boundaries can provide more barriers for dislocation glide in the other slip systems, resulting in higher strength for samples with smaller interspacing. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Strengthening mechanisms Phase transformation Twinning Medium entropy alloys Molecular dynamics simulations
DOI	10.1016/j.jmst.2020.12.017
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000661885200013
关键词[WOS]	MECHANICAL-PROPERTIES ; PHASE-TRANSFORMATION ; ATOMISTIC SIMULATIONS ; CRYOGENIC STRENGTH ; EQUIATOMIC CRCONI ; STRAIN ; DUCTILITY ; MICROSTRUCTURE ; EVOLUTION ; IMPACT
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助项目	National Key R&D Program of China[2017YFB0202802] ; National Key R&D Program of China[2017YFA0204402] ; National Key R&D Program of China[2019YFA02099-01] ; National Key R&D Program of China[2019YFA02099-02] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; National Natural Science Foundation of China[11672313] ; National Natural Science Foundation of China[11790293] ; National Natural Science Foundation of China[52071326] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503]
项目资助者	National Key R&D Program of China ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
论文分区	一类
力学所作者排名	1
RpAuthor	Yuan, Fuping
引用统计	被引频次：39[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/311007/86938
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, 15 West Rd,North 4th Ring, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ma Y,Yang MX,Yuan FP,et al. Deformation induced hcp nano-lamella and its size effect on the strengthening in a CoCrNi medium-entropy alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,82:122-134.
APA	马彦,杨沐鑫,袁福平,&武晓雷.(2021).Deformation induced hcp nano-lamella and its size effect on the strengthening in a CoCrNi medium-entropy alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,82,122-134.
MLA	马彦,et al."Deformation induced hcp nano-lamella and its size effect on the strengthening in a CoCrNi medium-entropy alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 82(2021):122-134.

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