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Title: On strain hardening mechanism in gradient nanostructures
Author: Li JJ; Weng GJ; Chen SH(陈少华); Wu XL(武晓雷)
Source: INTERNATIONAL JOURNAL OF PLASTICITY
Issued Date: 2017
Volume: 88, Pages:89-107
Abstract: Experiments have shown that a gradient design, in which grain size spans over four orders of magnitude, can make strong nanomaterials ductile. The enhanced ductility is attributed to the considerable strain hardening capability obtained in the gradient metals. A non-uniform deformation on the lateral sample surface is also observed. This might inject geometrically necessary dislocations (GNDs) into the sample. However, no direct evidence has been provided. Therefore the issues remain: why can the gradient structure generate high strain hardening, and how does it reconcile the strength-ductility synergy of gradient nanostructures? Here for the first time we quantitatively investigate the strain hardening of a gradient interstitial-free steel by developing a dislocation density-based continuum plasticity model, in which the interaction of the component layers in the gradient structure is represented by incorporating GNDs and back stress. It is demonstrated that both the surface non-uniform deformation and the strain-hardening rate up-turn can be quantitatively well predicted. The results also show that the strain hardening rate of the gradient sample can reach as high as that of the coarse-grained counterpart. A strength-ductility map is then plotted, which clearly show that the gradient samples perform much more superior to their homogeneous counterparts in strength-ductility synergy. The predicted map has been verified by a series of experimental data. A detailed analysis on GNDs distribution and back stress evolution at the end further substantiates our view that the good strain hardening capability results from the generation of abundant GNDs by the surface non-uniform deformation into the nano-grained layers of the gradient sample. (C) 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keyword: Ductility ; Dislocations ; Constitutive behavior ; Inhomogeneous material ; Analytic functions
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Li, JJ (reprint author), Northwestern Polytech Univ, Sch Mech Civil Engn & Architecture, Dept Engn Mech, Xian 710129, Shaanxi, Peoples R China.
Correspondent Email: jianjunli.mech@hotmail.com
DOI: 10.1016/j.ijplas.2016.10.003
Related URLs: 查看原文
DOC Type: 期刊论文
WOS Subject: Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS Subject Extended: Engineering ; Materials Science ; Mechanics
WOS Keyword Plus: Ductility ; Dislocations ; Constitutive behavior ; Inhomogeneous material ; Analytic functions
WOS ID: WOS:000389105300005
ISSN: 0749-6419
Funder: Alexander von Humboldt Foundation ; National Natural Science Foundation of China [11402203] ; Fundamental Research Funds for the Central Universities [3102015BJ(II)JGZ025] ; NSF Mechanics of Materials and Structures Program [CMMI-1162431] ; NSFC [11372317, 11532013, 11572328] ; 973 Nano-project [2012CB937500] ; 973 Program [2012CB932203]
Rank: [Li, Jianjun] Northwestern Polytech Univ, Sch Mech Civil Engn & Architecture, Dept Engn Mech, Xian 710129, Shaanxi, Peoples R China; [Li, Jianjun] Max Planck Inst Eisenforsch GmbH, Dept Microstruct Phys & Alloy Design, D-40237 Dusseldorf, Germany; [Weng, G. J.] Rutgers State Univ, Dept Mech & Aerosp Engn, New Brunswick, NJ 08903 USA; [Chen, Shaohua] Beijing Inst Technol, Inst Adv Struct Technol, Beijing 100081, Peoples R China; [Wu, Xiaolei] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Department: LNM材料介观力学性能的表征
Classification: 一类
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Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/59943
Appears in Collections:非线性力学国家重点实验室_期刊论文

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