Modelling of carbon nanotube dispersion and strengthening mechanisms in Al matrix composites prepared by high energy ball milling-powder metallurgy method

Liu, Z.Y.; Xiao, B.L.; Wang, W.G.; Ma, Ziqi

doi:10.1016/j.compositesa.2016.11.029

Cited by 92 publications

(18 citation statements)

References 33 publications

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“…However, many recent studies have reported the formation of occasional aluminium carbide (Al 4 C 3 ) nanoparticles, especially at the defect sites of nanotubes and along the residual amorphous carbon layers on the surface during multipasses FSP (Izadi & Gerlich, ; Liu et al ., , , ; Lim et al ., ). The same phase transformations were also observed during hot‐pressing of carbon nanotubes in the Al‐matrix at temperatures higher than 793 K (Liu et al ., ). Also, failure of CNTs during other SPD techniques such as MA, ARB and ECAP at room temperature under the repetitive high shear strains have been reported (Salimi et al ., ; Zare et al ., ; Pérez‐Bustamante et al ., ), because CNTs are more fragile when combined axial and radial loading is applied (Shen & Zhang, ).…”

Section: Resultsmentioning

confidence: 97%

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

Khodabakhshi

Nosko

Gerlich

2018

Journal of Microscopy

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Multipass friction-stir processing was employed to uniformly disperse multiwalled carbon nanotubes (MW-CNTs) within an Al-Mg alloy metal matrix. Decomposition of MW-CNTs occurs in situ as a result of solid-state chemical reactions, forming fullerene (C60) and aluminium carbide (Al C ) phases during reactive high temperature severe plastic processing. The effects of this decomposition on the microstructural features, dynamic restoration mechanisms and crystallographic microtextural developments are studied for the first time by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analysis. The formation of an equiaxed grain structure with an average size of ∼1.5 μm occurs within the stirred zone (SZ) under the influence of inclusions which hinder grain boundary migration via Zener-Smith pinning mechanisms during the discontinuous dynamic recrystallisation (DDRX). Formation of two strong Cubic and Brass microtextural components in the heat affected zone (HAZ) and thermomechanical affected zone (TMAZ) was noted as compared to the completely random and Cube components found in the base and SZ regions, respectively. The microstructural modification led to hardening and tensile strength improvement for the processed nanocomposite by ∼55% and 110%, respectively with respect to the annealed Al-Mg base alloy.

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Section: Resultsmentioning

confidence: 97%

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

Khodabakhshi

Nosko

Gerlich

2018

Journal of Microscopy

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“…The time required to flatten the spherical aluminium powder particles is proportional to the time interval between different ball collisions, 𝜏 (in minutes), that can be expressed by Eq. 5 [50]:…”

Section: Deformation Modelmentioning

confidence: 99%

Microstructure Dependent Dislocation Density Evolution in Micro-macro Rolled CNT/Al Composite

Sadeghi¹,

Cavaliere²

2021

Preprint

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Flake powder metallurgy combined with micro/macro rolling was employed to produce CNT/Al composites. The effect of deformation mode on the lamellar ultrafine grain structure and on the dislocation density was analyzed. Additionally, a model based on microstructure and processing parameters is proposed to analyze the effect of size, aspect ratio and crystallography texture of the matrix grains on dislocation density. It was shown that the dislocation density depends on CNTs dispersion degree and CNT-aluminum interfacial bonding level as a consequence of micro rolling process, as well as on the grain refinement, crystallography texture, and high aspect ratio resulted from macro-rolling process. It was demonstrated that the micro/macro rolling process provides the lamellar ultrafine grains with higher dislocation storage capability with respect to equiaxed grains. The described process indicated that it could provide good combination between the CNTs dispersion, CNT-aluminum interfacial bonding as well as crystallography texture, size and shape of the matrix grains.

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“…After the cold welding of the particles into coarse powders, the MWCNTs fixed at the welded seams become trapped inside the powders. Fracturing creates new surfaces, and the process can continue until the particles become hard and the adhesion of new nanotubes finalizes [34]. This is the reason why no nanotubes are visible on the surface of the particles after 4 h milling.…”

Section: Mwcnts Dispersion In the Composite Powdersmentioning

confidence: 99%

MWCNT-Reinforced AA7075 Composites: Effect of Reinforcement Percentage on Mechanical Properties

Feijoó

Peña

Cabeza

et al. 2021

Metals

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Metal–matrix composites (MMC) of aluminium alloy 7075 (AA7075) containing 1 wt.% and 0.5 wt.% multiwall carbon nanotubes (MWCNTs) were developed by powder metallurgy, using a high energy ball milling (HEBM) process for dispersion of the MWCNTs. The powder of the AA7075-MWCNT obtained was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microstructural changes produced during the milling process, such as the modification of the crystallite size, as well as the micro-deformation of the matrix crystal lattice, were determined using the Scherrer formula. After consolidation into a strip shape using the hot powder extrusion (HPE) process at 500 °C, no porosity was detected and a fine homogeneous dispersion of the reinforcement into the matrix was obtained. After performing a 0.2 HV test and tensile tests in the extruded profiles of both composites, a better combination of properties was found in samples of AA7075-0.5 wt.% MWCNT, with the increase in measured ductility being especially remarkable.

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Modelling of carbon nanotube dispersion and strengthening mechanisms in Al matrix composites prepared by high energy ball milling-powder metallurgy method

Cited by 92 publications

References 33 publications

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

Microstructure Dependent Dislocation Density Evolution in Micro-macro Rolled CNT/Al Composite

MWCNT-Reinforced AA7075 Composites: Effect of Reinforcement Percentage on Mechanical Properties

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