Carbon nanotube-reinforced aluminum matrix composites enhanced by grain refinement and in situ precipitation

Xu, Zhiyuan; Li, C. J.; Li, K. R.; Yi, Jianhong; Tang, Jun; Zhang, Q. X.; Liu, X. Q.; Bao, Rui; Li, X.

doi:10.1007/s10853-019-03411-0

Cited by 26 publications

(21 citation statements)

References 42 publications

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“…A constant strain rate of 10 ns −1 was used, and the transverse stresses were maintained at zero (s s = = 0 xx yy ) by adjusting the simulation cell size in the x-and y-directions. The virial stress tensor was calculated by using equation (5), which introduces the many-body potential and periodic boundary conditions [33].…”

Section: Simulation Proceduresmentioning

confidence: 99%

“…This is especially true when advanced polymeric composites, which retain the enhanced strength with relatively low-density, cannot replace metals. Engineered polymeric composites have shown improved strength and stiffness; however, their poor thermal stability, low toughness, and poor electrical conductivity limit their application [1].Thus, metals exhibiting high specific strengths such as aluminum (Al), titanium, and magnesium are still promising when low weight is critical such as in aerospace applications, automotive industries, electronic packaging, sports industries, etc [1,2] Metal matrix composites containing nanomaterials such as carbon nanotubes (CNTs) [3][4][5], boron nitride nanotubes [6][7][8] and graphene nanoplatelets [9][10][11] have been actively studied to improve mechanical properties [5,12], to add functionality to native materials [13], or to design functionally graded materials [14,15]. CNT-Al composites have been fabricated by several processing techniques such as melt processing, powder metallurgy, thermal spraying and electrochemical techniques [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Atomistic behavior of nanoporous carbon nanotube-aluminum composite under compressive loading

Suk

2020

Mater. Res. Express

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Metal matrix nanocomposites have been actively studied to discover the characteristics of a new class of materials. In the present study, metal matrix nanocomposites are investigated using molecular dynamics simulations of the compressive behavior of nanoporous carbon nanotube (CNT)aluminum (Al) composites that have a density of approximately 77% to that of pure Al. The weightreduced nanocomposites exhibited an enhanced Young's modulus of 138%, and a compressive strength degraded by 13% compared with pure Al. Through stress decomposition into CNT and Al constituents, it was observed that the Young's modulus was enhanced due to the high stiffness of the CNTs; further, the reduced strength was primarily due to the early failure strain. The effects of CNT volume fractions and sizes are further analyzed using the rule of mixture, which is modified by the interphase area definition. In addition, the atomistic details of the structure and stress revealed a buckling behavior in the CNT as well as a massive slip behavior in the Al matrix during plastic deformation. The results presented in this study will have implications in the design and development of metal matrix nanocomposites for applications in high-performance lightweight materials.

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Section: Simulation Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomistic behavior of nanoporous carbon nanotube-aluminum composite under compressive loading

Suk

2020

Mater. Res. Express

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“…where G m is the shear modulus, b is the Burgers vector in Al, and λ is the interparticle spacing. The Orowan strengthening in CNT-reinforced MMCs is well documented in the literature, [72,132,145,[158][159][160][161] although some authors ignored the strengthening mechanism by Orowan looping in the case that the CNTs were dispersed along the grain boundaries of the metal matrix. [46] When the Orowan strengthening mechanism is considered, Zhang and Chen [158,162] combined the strengthening effect and proposed a new equation as follows…”

Section: Orowan Loopingmentioning

confidence: 99%

“…The strength increment, when precipitates or dispersoids are bypassed via the Orowan looping mechanism, is given by

Δ σ_{OR} = \frac{0.13 G_{normalm} b}{λ} \ln (\frac{r}{boldb})

where

G_{normalm}

is the shear modulus, b is the Burgers vector in Al, and λ is the interparticle spacing. The Orowan strengthening in CNT‐reinforced MMCs is well documented in the literature, although some authors ignored the strengthening mechanism by Orowan looping in the case that the CNTs were dispersed along the grain boundaries of the metal matrix . When the Orowan strengthening mechanism is considered, Zhang and Chen combined the strengthening effect and proposed a new equation as follows

σ_{normalc} = (1 + \frac{v_{p}}{2}) (σ_{normalm} + A + B + \frac{A B}{σ_{m}})

A = 1.25 G_{normalm} b \sqrt{\frac{12 Δ α Δ T v_{normalp}}{b d_{normalp} false(1 - v_{normalp} false)}}

B = \frac{0.13 G_{normalm} b}{d_{normalp} 3extrue[{(\frac{1}{2 v_{normalp}})}^{1 / 3} - 1 3extrue]} \ln (\frac{d_{p}}{2 b})

where terms A and B correspond to the thermal mismatch and Orowan effects, respectively.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

“…The other phenomenon in the fatigue of MMCs is the “Bauschinger effect.” The decrease in the flow stress under cyclic loading upon the reversal of loading from tensile to compressive and vice versa is known as “Bauschinger effect.” In the case of CNT/Al composites, the dislocation pile‐up is induced by CNTs and leads to a back stress, due to which the composite exhibits superior strain hardening capacity compared with the base metal matrix . Back stress is a long‐range stress caused by the pile‐up of GNDs at the interface of metal matrix and reinforcement.…”

Section: Propertiesmentioning

confidence: 99%

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Carbon Nanotube‐Reinforced Aluminum Matrix Composites

Mohammed

Chen

2019

Adv Eng Mater

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Herein, the investigations conducted in the area of aluminum (Al) matrix composites reinforced with carbon nanotubes (CNTs) are presented. The application of CNT reinforcement in Al alloys is driven by its exceptional chemical and mechanical properties. The critical issues in the processing techniques, challenges in the interfacial mechanisms between the Al matrix and CNTs, and strengthening effects due to the presence of reinforcements are reviewed. The mechanical properties of CNT/Al composites are found to be effectively enhanced with an addition of CNTs even at a small amount. The extent of strength improvements depends mainly on the dispersion of CNTs in the matrix and interfacial bonding between the matrix and CNTs. Limited theoretical modeling can predict the properties of CNT/Al composites to some extent, but without considering the detailed processing parameters. Based on the gaps identified here, future research directions are suggested, including the relationships between the processing parameters and micro-and nanostructures, and multiscale mechanical modeling and simulation, aiming to further understand the strengthening mechanisms and develop advanced CNT-reinforced Al and other metal composites for critical engineering applications.

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Effect of Hot Extrusion Ratio on the Mechanical Properties and Microstructure of a 0.5 wt.% Graphene Nanoplatelet-Reinforced Aluminum Matrix Composite

Lou

Ran

Liu

et al. 2022

J. of Materi Eng and Perform

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Carbon nanotube-reinforced aluminum matrix composites enhanced by grain refinement and in situ precipitation

Cited by 26 publications

References 42 publications

Atomistic behavior of nanoporous carbon nanotube-aluminum composite under compressive loading

Atomistic behavior of nanoporous carbon nanotube-aluminum composite under compressive loading

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

Effect of Hot Extrusion Ratio on the Mechanical Properties and Microstructure of a 0.5 wt.% Graphene Nanoplatelet-Reinforced Aluminum Matrix Composite

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