Dense dispersed shear bands in gradient-structured Ni

doi:10.1016/j.ijplas.2019.08.012

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Dense dispersed shear bands in gradient-structured Ni
	Wang YF 1,2; Huang CX 2; Li YS 4; Guo FJ 2; He Q 2; Wang MS 2; Wu XL(武晓雷)3; Scattergood RO 1; Zhu YT 1
刊名	INTERNATIONAL JOURNAL OF PLASTICITY
	2020
卷号	124 页码:186-198
关键词	Gradient structure Shear bands Ductility Synergistic constraint Strength heterogeneity Nanostructured metal
ISSN号	0749-6419
DOI	10.1016/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
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关键词	BULK METALLIC GLASSES ; MECHANICAL-PROPERTIES ; RESIDUAL-STRESS ; STAINLESS-STEEL ; HIGH-STRENGTH ; BACK STRESS ; PLASTICITY ; NANOCRYSTALLINE ; DEFORMATION ; DUCTILITY
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
内容类型	期刊论文
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.North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA; 2.Sichuan Univ, Sch Aeronaut & Astronaut, Chengdu 610065, Sichuan, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 4.Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nano & Heterogeneous Struct Mat Ctr, Nanjing 210094, Jiangsu, 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.