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Dense dispersed shear bands in gradient-structured Ni

文献类型：期刊论文

作者Wang YF3,4; Huang CX4; Li YS2; Guo FJ4; He Q4; Wang MS4; Wu XL(武晓雷)1; Scattergood RO3; Zhu YT3
刊名INTERNATIONAL JOURNAL OF PLASTICITY
出版日期2020
卷号124页码:186-198
ISSN号0749-6419
关键词Gradient structure Shear bands Ductility Synergistic constraint Strength heterogeneity Nanostructured metal
DOI10.1016/j.ijplas.2019.08.012
通讯作者Huang, Chongxiang(chxhuang@scu.edu.cn) ; Zhu, Yuntian(ytzhu@ncsu.edu)
英文摘要During 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.
分类号一类
WOS关键词BULK METALLIC GLASSES ; MECHANICAL-PROPERTIES ; RESIDUAL-STRESS ; STAINLESS-STEEL ; HIGH-STRENGTH ; BACK STRESS ; PLASTICITY ; NANOCRYSTALLINE ; DEFORMATION ; DUCTILITY
资助项目National 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
WOS研究方向Engineering ; Materials Science ; Mechanics
语种英语
WOS记录号WOS:000502893800012
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Sichuan Youth Science and Technology Foundation ; Chinese Scholar Council
其他责任者Huang, Chongxiang ; Zhu, Yuntian
源URL[http://dspace.imech.ac.cn/handle/311007/81240]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
2.Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nano & Heterogeneous Struct Mat Ctr, Nanjing 210094, Jiangsu, Peoples R China;
3.North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA;
4.Sichuan Univ, Sch Aeronaut & Astronaut, Chengdu 610065, Sichuan, Peoples R China;
推荐引用方式
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.

入库方式： OAI收割

来源：力学研究所

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