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Tensile deformation mechanisms of the hierarchical structure consisting of both twin-free grains and nanotwinned grains
Yuan FP(袁福平); Chen P(陈萍); Wu XL(武晓雷); Yuan FP(袁福平)
Source PublicationPhilosophical Magazine Letters
2014
Volume94Issue:8Pages:514-521
ISSN0950-0839
Abstract
A series of large-scale molecular dynamics simulations have been performed to investigate the tensile properties and atomistic deformation mechanisms for the nanostructured Cu with three typical microstructures: the hierarchical structure consisting of both twin-free grains (d = 70 nm) and grains with bundles of smaller nanotwins (d = 70 nm, λ = 10 nm), the fully nanograined structure and the fully nanotwinned structure. The average flow stress of the hierarchically structure is found to be higher than that calculated by rule of mixture. As compared with that of fully nanograined structure, the strength for the twin-free grains in the hierarchical structure is promoted and gives extra hardening due to the increased dislocation density and dislocation behaviours. It is also found that the nanotwin bundles are more deformable than the twin-free grains in the hierarchical structure according to the deviatoric strain invariant contour. This indicates that the fully nanograined structure cannot only be strengthened to a higher level, but also obtain better ductility by embedded with stronger bundles of smaller nanotwins. Thus, a superior strength–ductility synergy could be obtained in this kind of hierarchical structures, and this novel strategy has also been implemented in bulk austenitic steels or copper by recent experiments.
KeywordMolecular Dynamics Simulations Dislocation Interactions Deformation Mechanisms Nanostructured Materials
Subject Area损伤、破坏机理和微结构演化 ; 新型材料的力学问题 ; 计算固体力学
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000342211000007
DepartmentLNM材料介观力学性能的表征
ClassificationQ3
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49114
Collection非线性力学国家重点实验室
Corresponding AuthorYuan FP(袁福平)
Recommended Citation
GB/T 7714
Yuan FP,Chen P,Wu XL,et al. Tensile deformation mechanisms of the hierarchical structure consisting of both twin-free grains and nanotwinned grains[J]. Philosophical Magazine Letters,2014,94(8):514-521.
APA Yuan FP,Chen P,Wu XL,&袁福平.(2014).Tensile deformation mechanisms of the hierarchical structure consisting of both twin-free grains and nanotwinned grains.Philosophical Magazine Letters,94(8),514-521.
MLA Yuan FP,et al."Tensile deformation mechanisms of the hierarchical structure consisting of both twin-free grains and nanotwinned grains".Philosophical Magazine Letters 94.8(2014):514-521.
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