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Enhanced strain delocalization through formation of dispersive micro shear bands in laminated Ni
Liang, Fei1,2; Zhang, Bin3; Yong, Yue3; Luo, Xue-Mei1; Zhang, Guang-Ping1
Corresponding AuthorZhang, Bin(zhangb@atm.neu.edu.cn) ; Zhang, Guang-Ping(gpzhang@imr.ac.cn)
2020-09-01
Source PublicationINTERNATIONAL JOURNAL OF PLASTICITY
ISSN0749-6419
Volume132Pages:16
AbstractNanocrystalline metals usually exhibit limited ductility due to catastrophic shear fracture caused by the preferential formation of a few premature shear bands during tensile deformation. In this work, the tensile and fracture behavior of laminated Ni with varied degree of difference in grain size of hard and soft layers were investigated. Compared with monolithic nanocrystalline Ni, laminated Ni with a large difference in the grain size of hard and soft layers exhibited enhanced elongation to failure without sacrificing tensile strength, because the formation of dispersive micro shear bands could undertake large plastic strain and lead to strain delocalization. With decreasing the difference in the grain size of hard and soft layers and the corresponding resistance to propagation of micro shear bands, there is a transition of fracture mode from ductile necking fracture accompanied with dispersive micro shear bands to shear fracture dominated by a few macroscopic premature shear bands. A mechanical model based on the transition from grain interior dislocation emission to grain-boundary-mediated deformation within the soft layers was proposed and the critical grain size of the soft layers corresponding to the optimum synergy of high strength and ductile necking fracture was obtained.
KeywordLaminated composite Necking Shear band Fracture Interface
Funding OrganizationNational Natural Science Foundation of China (NSFC) ; Fundamental research project of Shenyang National Laboratory for Materials Science
DOI10.1016/j.ijplas.2020.102745
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[51971060] ; National Natural Science Foundation of China (NSFC)[51671050] ; National Natural Science Foundation of China (NSFC)[51771207] ; Fundamental research project of Shenyang National Laboratory for Materials Science[L2019R18]
WOS Research AreaEngineering ; Materials Science ; Mechanics
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS IDWOS:000553471300007
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/140061
Collection中国科学院金属研究所
Corresponding AuthorZhang, Bin; Zhang, Guang-Ping
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, 3-11 Wenhua Rd, Shenyang 110819, Peoples R China
Recommended Citation
GB/T 7714
Liang, Fei,Zhang, Bin,Yong, Yue,et al. Enhanced strain delocalization through formation of dispersive micro shear bands in laminated Ni[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2020,132:16.
APA Liang, Fei,Zhang, Bin,Yong, Yue,Luo, Xue-Mei,&Zhang, Guang-Ping.(2020).Enhanced strain delocalization through formation of dispersive micro shear bands in laminated Ni.INTERNATIONAL JOURNAL OF PLASTICITY,132,16.
MLA Liang, Fei,et al."Enhanced strain delocalization through formation of dispersive micro shear bands in laminated Ni".INTERNATIONAL JOURNAL OF PLASTICITY 132(2020):16.
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