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
Corresponding AuthorYuan, Fuping(fpyuan@lnm.imech.ac.cn)
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
2021-08-20
Volume82Pages:122-134
ISSN1005-0302
AbstractDeformation-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.
KeywordStrengthening mechanisms Phase transformation Twinning Medium entropy alloys Molecular dynamics simulations
DOI10.1016/j.jmst.2020.12.017
Indexed BySCI ; EI
Language英语
WOS IDWOS:000661885200013
WOS KeywordMECHANICAL-PROPERTIES ; PHASE-TRANSFORMATION ; ATOMISTIC SIMULATIONS ; CRYOGENIC STRENGTH ; EQUIATOMIC CRCONI ; STRAIN ; DUCTILITY ; MICROSTRUCTURE ; EVOLUTION ; IMPACT
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding ProjectNational 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]
Funding OrganizationNational 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
Classification一类
Ranking1
ContributorYuan, Fuping
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/86938
Collection非线性力学国家重点实验室
Affiliation1.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
Recommended Citation
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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