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Dense dispersed shear bands in gradient-structured Ni
Wang YF1,2; Huang CX1; Li YS3; Guo FJ1; He Q1; Wang MS1; Wu XL(武晓雷)4; Scattergood RO2; Zhu YT2
Corresponding AuthorHuang, Chongxiang( ; Zhu, Yuntian(
AbstractDuring tensile deformation, nanostructured (NS) metals often fail soon after yielding by forming a localized shear band. Here we report the observation of high density of shear bands that are homogeneously dispersed in the NS layer of a gradient Ni sample. These shear bands were nucleated at early elastic/plastic strain stage, reached number saturation at similar to 3% strain, and remained arrested by the central coarse-grained (CG) matrix during the entire plastic deformation, resulting in a uniform tensile plasticity comparable to that of CG matrix. The formation of dispersed shear bands was promoted by the elastic/plastic interaction between NS surface layer and CG matrix, and affected by the surface roughness and the hardness variation in the NS surface layer. The width of shear bands remained constant, but the intensity of strain accumulation increased almost linearly with applied tensile strain, suggesting a stable shear banding process. Microstructure examination revealed that the strain in shear bands was accommodated by mechanically driven grain boundary migration and grain coarsening. These results clarify the fundamental questions: why/how does the NS layer supported by CG matrix achieve large uniform elongation? Moreover, the findings demonstrate the possibility of activating dispersed stable shear bands by synthesizing gradient architecture for optimized mechanical performances, i.e., a new strategy for evading the strength-ductility tradeoff in NS metals.
KeywordGradient structure Shear bands Ductility Synergistic constraint Strength heterogeneity Nanostructured metal
Indexed BySCI ; EI
WOS IDWOS:000502893800012
WOS Research AreaEngineering ; Materials Science ; Mechanics
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
Funding ProjectNational Key R&D Program of China[2017YFA0204403] ; National Natural Science Foundation of China[11672195] ; National Natural Science Foundation of China[51931003] ; National Natural Science Foundation of China[51741106] ; Sichuan Youth Science and Technology Foundation[2016JQ0047] ; Chinese Scholar Council
Funding OrganizationNational Key R&D Program of China ; National Natural Science Foundation of China ; Sichuan Youth Science and Technology Foundation ; Chinese Scholar Council
ContributorHuang, Chongxiang ; Zhu, Yuntian
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Sichuan Univ, Sch Aeronaut & Astronaut, Chengdu 610065, Sichuan, Peoples R China;
2.North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA;
3.Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nano & Heterogeneous Struct Mat Ctr, Nanjing 210094, Jiangsu, Peoples R China;
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wang YF,Huang CX,Li YS,et al. Dense dispersed shear bands in gradient-structured Ni[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2020,124:186-198.
APA Wang YF.,Huang CX.,Li YS.,Guo FJ.,He Q.,...&Zhu YT.(2020).Dense dispersed shear bands in gradient-structured Ni.INTERNATIONAL JOURNAL OF PLASTICITY,124,186-198.
MLA Wang YF,et al."Dense dispersed shear bands in gradient-structured Ni".INTERNATIONAL JOURNAL OF PLASTICITY 124(2020):186-198.
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