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Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures
Ma Y(马彦); Yuan FP(袁福平); Yang MX(杨沐鑫); Jiang P(姜萍); Ma E; Wu XL(武晓雷)
Source PublicationACTA MATERIALIA
2018-04-15
Volume148Pages:407-418
ISSN1359-6454
AbstractSingle-phase CrCoNi medium-entropy alloys (MEA) are emerging recently as an interesting class of metallic materials, but the dynamic response of this MEA at high strain rates remains unknown. Here we have produced this MEA with various heterogeneous microstructures, using cold rolling followed by annealing at various temperatures. The high-strain-rate response of the MEAs was characterized using hat-shaped specimens in Hopkinson-bar experiments. A combination of high dynamic shear yield strength and large uniform dynamic shear strain was observed, exceeding all other metals and alloys reported so far. Even better dynamic shear properties was revealed when the experiments were conducted at cryogenic temperature. The strong strain hardening under dynamic shear loading can be attributed to the dynamic grain refinement and deformation twinning that accompany the homogeneous shear deformation. When compared to room temperature, the efficiency of grain refinement was found to be enhanced at cryogenic temperature, with a higher density of multiple twins, stacking faults, Lomer-Cottrell locks, and hcp phase via phase transformation inside the grains, which could be responsible for the better dynamic shear properties under cryogenic environment. (c) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordMedium-entropy alloys Dynamic shear properties Grain refinement Lomer-Cottrell locks Phase transformation
DOI10.1016/j.actamat.2018.02.016
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000428823100039
WOS KeywordSEVERE PLASTIC-DEFORMATION ; ADIABATIC LOCALIZED SHEAR ; CENTERED-CUBIC METALS ; SOLID-SOLUTION ALLOYS ; MECHANICAL-PROPERTIES ; STRAIN-RATE ; GRADIENT STRUCTURE ; DAMAGE-TOLERANCE ; STEEL ; DUCTILITY
WOS Research AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Key R&D Program of China [2017YFA0204402] ; National Natural Science Foundation of China [11472286, 11672313, 11790293, 11572328, 51701228, 51601204] ; Chinese Academy of Sciences [XDB22040503]
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Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77820
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
3.Johns Hopkins Univ, Dept Mat Sci & Engn, 3400 North Charles St, Baltimore, MD 21218 USA
Recommended Citation
GB/T 7714
Ma Y,Yuan FP,Yang MX,et al. Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures[J]. ACTA MATERIALIA,2018,148:407-418.
APA 马彦,袁福平,杨沐鑫,姜萍,Ma E,&武晓雷.(2018).Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures.ACTA MATERIALIA,148,407-418.
MLA 马彦,et al."Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures".ACTA MATERIALIA 148(2018):407-418.
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