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Anomalous size effect in micron-scale CoCrNi medium-entropy alloy wire
Chen JX(陈金玺)1,2; Chen Y(陈艳)1,2; Liu JP(刘俊鹏)1; Liu TW(刘天威)1,2; Dai LH(戴兰宏)1,2,3
Corresponding AuthorChen, Yan( ; Dai, Lan-Hong(
AbstractMicron-sized CoCrNi medium-entropy alloy (MEA) wires are successfully fabricated by Taylor-Ulitovsky method for the first time. The wires of two different sizes, with diameters of 40 and 100 microns, ex-hibit an excellent combination of tensile strength and ductility. In-depth microstructure characterization indicates the superior mechanical properties stem from the synergy of Lomer-Cottrell locks, mechani-cal nano-twinning and HCP stacking. Surprisingly, an anomalous size effect is presented in the tension of these microwires, i.e., the much higher tension strength and ductility are observed in the 40 micron-wire, in sharp contrast to conventional single-principal element alloys only showing negligibly minor tension size effect. Much higher density of geometrically necessary dislocation accompanying heterogeneous de-formation is observed in 40 micron-wire, leading to a high strain gradient, which is in turn joined with multiple deformation twins giving rise to high strength and ductility in 40 micron-wire. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordMedium-entropy alloy wire Size effect Strain gradient Multiple deformation twins
Indexed BySCI ; EI
WOS IDWOS:000641970600007
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding ProjectNational Key Research and Development Program of China[2017YFB0702003] ; NSFC[11790292] ; NSFC[11972346] ; NSFC[51901235] ; NSFC[11988102] ; Strategic Priority Research Program[XDB22040302] ; Strategic Priority Research Program[XDB22040303] ; Key Research Program of Frontier Sciences[QYZDJSSW-JSC011] ; Science Challenge Project[TZ2018001]
Funding OrganizationNational Key Research and Development Program of China ; NSFC ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences ; Science Challenge Project
ContributorChen, Yan ; Dai, Lan-Hong
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Chen JX,Chen Y,Liu JP,et al. Anomalous size effect in micron-scale CoCrNi medium-entropy alloy wire[J]. SCRIPTA MATERIALIA,2021,199:6.
APA 陈金玺,陈艳,刘俊鹏,刘天威,&戴兰宏.(2021).Anomalous size effect in micron-scale CoCrNi medium-entropy alloy wire.SCRIPTA MATERIALIA,199,6.
MLA 陈金玺,et al."Anomalous size effect in micron-scale CoCrNi medium-entropy alloy wire".SCRIPTA MATERIALIA 199(2021):6.
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