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 | |
刊名 | INTERNATIONAL JOURNAL OF PLASTICITY |
2020-09-01 | |
卷号 | 132页码:16 |
关键词 | Laminated composite Necking Shear band Fracture Interface |
ISSN号 | 0749-6419 |
DOI | 10.1016/j.ijplas.2020.102745 |
通讯作者 | Zhang, Bin(zhangb@atm.neu.edu.cn) ; Zhang, Guang-Ping(gpzhang@imr.ac.cn) |
英文摘要 | Nanocrystalline 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. |
资助项目 | National 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研究方向 | Engineering ; Materials Science ; Mechanics |
语种 | 英语 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
WOS记录号 | WOS:000553471300007 |
资助机构 | National Natural Science Foundation of China (NSFC) ; Fundamental research project of Shenyang National Laboratory for Materials Science |
内容类型 | 期刊论文 |
源URL | [http://ir.imr.ac.cn/handle/321006/140062] |
专题 | 金属研究所_中国科学院金属研究所 |
通讯作者 | Zhang, Bin; Zhang, Guang-Ping |
作者单位 | 1.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 |
推荐引用方式 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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