Twin-induced template effect on the inelastic deformation of hierarchically nanotwinned copper under indentation and scratch

Zheng, Yonggang; Ye, Hongfei; Zhang, Hongwu

doi:10.1177/1056789515574123

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…For all simulations, a time step of 2 fs is used. The common neighbor analysis method [ 17 , 18 ] is used to determine the local crystalline order of silver atoms in order to identify the dislocation core, stacking fault, deformation twin, and nanostructure evolution [ 19 , 20 ] which can be visualized by OVITO [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

Vibration-Induced Property Change in the Melting and Solidifying Process of Metallic Nanoparticles

Zheng

Ding

et al. 2017

Nanoscale Res Lett

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Tuning material properties in the 3-D printing process of metallic parts is a challenging task of current interests. Much research has been conducted to understand the effects of controlling parameters such as the particle geometry (size and shape), heating, and cooling ways on the outcome of the printing process. However, nothing has been done to explore the system vibration effect. This letter reports our findings on the vibration-induced property change in the melting and solidifying process of silver nanoparticles with the use of molecular dynamics simulation. We find that the increase of system vibration magnitude would increase the number fraction of disordered atoms, which in turn changes the nanostructure of solidified products. For a given system vibration magnitude, the number fraction of disordered atoms reaches the maximum around the system natural frequency so that the stiffness of solidified products becomes the minimum. Since this trend is not affected by the system size, the above findings reveal a feasible path toward the real-time tuning of material properties for advancing additive manufacturing.

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Section: Methodsmentioning

confidence: 99%

Vibration-Induced Property Change in the Melting and Solidifying Process of Metallic Nanoparticles

Zheng

Ding

et al. 2017

Nanoscale Res Lett

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“…And the MD simulation results of the inelastic deformation behavior of hierarchically nanotwinned copper under indentation and scratch reveal that the partial dislocation activities are the main factor that dominates the inelastic deformation. [ 18 ] Gradient materials generate strain strength gradient stemming from the generation and evolution of GNDs during plastic deformation. [ 19 ] Li et al [ 20 ] quantitatively investigated the strain hardening process of gradient‐structured IF steels by developing a dislocation density‐based continuum plasticity model.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study

Qiang

Long

2023

Physica Status Solidi (a)

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Unlike conventional homogeneous nanograined (NG) materials, gradient structured materials combine high strength and ductility. The gradient nanograined (GNG) structures are divided into three zones by grain size: the small‐grained zone, the transition‐grained zone, and the large‐grained zone. Molecular dynamics (MD) simulation is performed to investigate the effect of the widths of zones on the strength of GNG structures with different grain sizes. The simulation results reveal the strengthening mechanism of GNG structures from the perspective of microstructure evolution. With the change in grain size, the dominant deformation mode changes from grain boundary (GB) activities in the mall‐grained zone to dislocation slip in the large one. The inverse Hall–Petch phenomenon is observed during plastic deformation. Synergistic strengthening of dislocation and heterodeformation induced (HDI) can be achieved in the structure by regulating the widths of zones with different grain sizes.

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“…Therefore, it is of great importance to improve the strength of NMMMs without sacrificing their ductility and interface stability. Recently, experimental and numerical studies have demonstrated that twin boundaries, which have extremely low interfacial energy and can effectively hinder dislocation motion, are promising stable interfaces for strengthening metals and thus alleviate the trade-off between strength and ductility presented in conventional materials [11][12][13][14]. Hence, several kinds of multilayered materials with nanoscale growth twins in each layer have been successfully fabricated, such as Cu//Au NMMMs, Cu//Ag NMMMs, Cu//Fe NMMMs, Cu//Ni NMMMs and so on [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Hetero interface and twin boundary mediated strengthening in nano-twinned Cu//Ag multilayered materials

Zheng

Zhang

et al. 2017

Nanotechnology

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Based on molecular dynamics simulations, tensile mechanical properties and plastic deformation mechanisms of nano-twinned Cu//Ag multilayered materials are investigated in this work. Simulation results show that, due to the stronger strengthening effect of the twin boundary than both the cube-on-cube and hetero-twin interfaces between Cu and Ag layers, the strength increases with the increase of layer thickness for nano-twinned Cu//Ag multilayered materials with a constant twin spacing, while it decreases with the increase of layer thickness for twin-free ones. The strength of hetero-twin multilayered materials is higher than that of the cube-on-cube samples due to the different hetero interfacial configurations. The confined layer slip of dislocation is found to be the dominant plastic deformation mechanism for twin-free hetero-twin multilayered materials and the strength versus twin spacing in nano-twinned samples follows the conventional Hall-Petch relationship. These findings will shed light on the understanding of the plastic deformation mechanisms and the fabrication of high strength nano-twinned multilayered metallic materials.

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Twin-induced template effect on the inelastic deformation of hierarchically nanotwinned copper under indentation and scratch

Cited by 6 publications

References 36 publications

Vibration-Induced Property Change in the Melting and Solidifying Process of Metallic Nanoparticles

Vibration-Induced Property Change in the Melting and Solidifying Process of Metallic Nanoparticles

Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study

Hetero interface and twin boundary mediated strengthening in nano-twinned Cu//Ag multilayered materials

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