Grain boundary-assisted deformation in graphene–Al nanolaminated composite micro-pillars

Zhao, Lei; Guo, Qiang; Li, Zan; Fan, Genlian; Li, Zhiqiang; Xiong, Ding‐Bang; Su, Yishi; Tan, Zhanqiu; Guo, Cheng; Zhang, Di

doi:10.1080/21663831.2017.1386241

Cited by 27 publications

(6 citation statements)

References 41 publications

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“…HS materials have very diverse microstructures [1], including heterogeneous lamella structure [2], gradient structure [3][4][5][6][7][8], laminate structure [9,10], dual phase CONTACT Yuntian Zhu ytzhu@ncsu.edu; Xiaolei Wu xlwu@imech.ac.cn structure [11][12][13], harmonic structure [14][15][16], bi-modal structure [17][18][19][20], metal matrix composites [21][22][23][24][25][26], etc. These apparently very diverse structures have a common feature: all of them consist of both soft domains and hard domains with dramatically different flow stresses (or strength) [1].…”

Section: Introductionmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

788

135

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Heterostructured materials have been reported as a new class of materials with superior mechanical properties, which was attributed to the development of back stress. There are numerous reports on back stress theories and measurements with no consensus. Back stress is developed in soft domains to offset the applied stress, making them appear stronger, while forward stress is developed to make hard domains appear weaker. The extra hardening in heterostructured materials is resulted from interactions between back stresses and forward stresses, and should be described as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress. IMPACT STATEMENT The 'back stress' hardening in the literature can be described more accurately as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress.

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Section: Introductionmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

788

135

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“…flow (6) where M is the Taylor factor, b is the length of the Burgers vector of perfect dislocations in Cu, h′ is the layer thickness parallel with the sliding plane, h is the thickness of individual single-layer Cu, with h = h′ sin 71.2°, ν is the Poisson's ratio of Cu, f is the characteristic interface stress, μ* is the mean shear modulus, α is the core cutoff parameter, and L is the mean shear spacing of the sliding array (L = b/ε). Considering that in the plastic flow stage, Shockley partial dislocations dominates plastic deformation, we replace b with b p , i.e., the length of the Burgers vector of the partial dislocations in Cu, and rewrite eq 6 as…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Traditional reinforcement constituents are usually hard materials with higher strength, such as silicon carbide, aluminum oxide, and titanium carbide . In recent years, nanocarbon materials have also been considered because of their excellent mechanical and physical properties, among which graphene (Gr) is one of the most promising representatives − because of its ultrahigh intrinsic strength (∼130 GPa) and Young’s modulus (1000 GPa). − …”

Section: Introductionmentioning

confidence: 99%

“…Using Gr as a reinforcement for MMCs is an effective way to exert its excellent properties . Many studies have demonstrated that Gr-reinforced MMCs possess higher strength than traditional metal materials. − Kim et al fabricated some nanolaminated MMCs with alternant metal and monolayer Gr and found that Gr/Cu and Gr/Ni MMCs have ultrahigh strength up to 1.5 and 4.0 GPa, respectively . Zhao et al prepared Gr-reinforced Cu and Al-based composites with a nanolaminated structure using improved powder metallurgy technology and obtained excellent strength and toughness …”

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics Studies on Size Effects in Laminated Polycrystalline Graphene/Copper Composites: Implications for Mechanical Behavior

Weng

Fang

Zhao

et al. 2021

ACS Appl. Nano Mater.

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Nanolaminated graphene/metal composites possess many outstanding mechanical properties due to the high loadbearing capacity of graphene. Considering that actually prepared graphene is usually polycrystalline, in this work, the mechanical responses of nanolaminated polycrystalline graphene/copper (PGr/Cu) composites subjected to uniaxial compression were simulated using the molecular dynamics method. The effects of grain boundary and size (the thickness of the Cu layer, h, and the size of PGr grains, d) on the mechanical properties and the underlying mechanisms were explored. It was found that h affects the mechanical responses in both the elastic and plastic stages, and the mechanical properties of the composites could be enhanced with the decrease of h, while d mainly affects the mechanical behavior in the elastic stage and has a negligible effect on the plastic stage. It was also found that extended dislocations would dominate the plastic deformation of the nanolaminated PGr/Cu composites. Two dislocation propagation paths were observed, and the interfacial barrier that hinders the propagation of dislocations is the primary strengthening mechanism. It was suggested that the confined layer slip model could be extended to predict the strength of the nanolaminated PGr/Cu composites. The results presented would be of great significance for the engineering application of nanolaminated polycrystalline graphene/copper composites.

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“…5,[12][13][14][15][16][17][18][19][20][21][22][23] However, the flow stress of nano-twinned metals was found to decrease right after yielding, showing rather limited work hardening ability. 17,[24][25][26] Alternatively, inspired by the concept of "grain boundary engineering" that could improve the work hardening ability of metallic composites, [27][28][29][30][31][32][33][34][35] graphene that processed ultrahigh Young's modulus and tensile strength [36][37][38][39][40][41][42] was applied not only to be the reinforced phase but also to introduce metal/graphene interfaces thus may enhance the mechanical properties of the composites.…”

Section: Introductionmentioning

confidence: 99%

Dislocation re-emission induced staged work hardening in graphene-nanotwin reinforced Cu: A molecular dynamics simulation study

Zhang

Huang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Graphene and nanotwins are two effective reinforced microstructural features to achieve improved mechanical properties of metallic composites, while the two features are generally applied separately. In this study, graphene/nano-twinned Cu nanocomposites models with different arrangement of the graphene and twin boundaries were designed by using molecular dynamics (MD) simulations, and the dislocation processes and the interactions between dislocation and graphene/twin were simulated and investigated. The simulation results indicated the arrangement of graphene and nanotwin affects the work hardening behaviors in the graphene/nano-twinned Cu composites, i.e., two staged work hardening behavior corresponded to cyclic process of dislocation hindrance-absorption-reemission in the model with relatively small twin spacing and twin-graphene spacing, while the work hardening dominated by dislocation intersection and multiplication occurred in the model with large twin-spacing. The simulation provided herein demonstrated that the special arrangement of graphene and nanotwins led a way to tailoring the mechanical properties of metallic composites with various work hardening behaviors. Graphical abstract Highlights 1. Dislocation reactions between twins and graphene were simulated and analyzed. 2. Twin-graphene distance and the twin distance play key roles in the reaction. 3. The mechanism corresponding to work hardening changes in the limited two distances.

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Grain boundary-assisted deformation in graphene–Al nanolaminated composite micro-pillars

Cited by 27 publications

References 41 publications

Perspective on hetero-deformation induced (HDI) hardening and back stress

Perspective on hetero-deformation induced (HDI) hardening and back stress

Molecular Dynamics Studies on Size Effects in Laminated Polycrystalline Graphene/Copper Composites: Implications for Mechanical Behavior

Dislocation re-emission induced staged work hardening in graphene-nanotwin reinforced Cu: A molecular dynamics simulation study

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