Microstructural evaluation and mechanical properties of Al-CNT nanocomposites produced by different processing methods

Rikhtegar, F.; Shabestari, S.G.; Sadrnia, Hassan

doi:10.1016/j.jallcom.2017.06.222

Cited by 35 publications

(7 citation statements)

References 38 publications

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“…Related studies reported the bridging effect at the fracture surface of the reinforced specimens [23,[32][33][34]; a similar effect was observed in this study (Figure 2a), although the associated strengthening was not very strong. Microscopy observations highlighted that the crack, nucleated in a hardness indentation, had propagated through the MWCNT agglomerates to a region of the matrix where the nanotubes made it difficult to sinter the aluminum particles.…”

Section: Discussionsupporting

confidence: 89%

Effect of Reinforcement Type and Dispersion on the Hardening of Sintered Pure Aluminium

Emadinia

Vieira

2018

Metals

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The homogeneity of dispersion and reinforcing of pure aluminium by multi-walled carbon nanotubes (MWCNT) through the application of a high speed sonication (340 Hz) assisted by ultrasonication (35 kHz) was evaluated, this method was termed “assisted sonication”. Other reinforcements (graphene, nanoalumina, and ultrafine tungsten carbide) were used for comparison with the MWCNT. The hardness measurement enabled us to evaluate the strengthening effect of the reinforcements. Raman analysis was the technique selected to evaluate the integrity of MWCNTs during dispersion. The scanning and transmission electron microscopies revealed the dispersion and microstructure of the nanoreinforcements and nanocomposites. After applying the assisted sonication, the MWCNTs were detangled without exfoliation. The integrity of MWCNTs was strongly influenced by the presence of the aluminum powder during dispersion. The application of the assisted sonication method reduced the size of the aggregates in the matrix, in comparison with the sonication technique. Ultrafine tungsten carbide, with a 1 vol. %, was the reinforcement that more effectively hardened aluminum due to a good dispersion of the reinforcement, grain refinement and the formation of Al12W phase.

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Section: Discussionsupporting

confidence: 89%

Effect of Reinforcement Type and Dispersion on the Hardening of Sintered Pure Aluminium

Emadinia

Vieira

2018

Metals

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“…Besides, microstructural changes and the amount of porosity also change the wear properties. MgO-MWCNT reinforcements in Al 2024 metal matrix contributed to the improvement of hardness properties [27,28].…”

Section: Methodsmentioning

confidence: 99%

AL2024 Kompozitlerin Aşınma Karakteristiği

Ergül¹

2020

El-Cezeri Fen Ve Mühendislik Dergisi

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Composite materials have high specific strength and modulus of elasticity compared to traditional materials, thus, over the past 10-20 years, the demand for these kinds of materials has increased significantly due to their specific properties. This means, the weight of the machine component produced from these materials can be reduced. In this study, the mold casting method was used in the production of Al 2024 matrix composite materials. In sample production, 50% MgO and 50% MWCNT are mixed by weight and added to the matrix material in the ratio of 0.2% -0.5% -1% -2%. The hardness and wear behaviors of Al 2024 composites with MgO / MWCNT additive were investigated using Rockwell tester and a ball-on-disc wear tester. The effects of composite materials on the wear properties have been investigated by determining the wear weight loss. 5N load and 250 m distance were chosen as the wear test parameters and percent wear amounts of the samples were examined. It was observed that hardness values of samples increased, and the wear percentage of specimens decreased with the addition of reinforcement. The best ratio for the composite design is the mixing of 50 wt.% + MgO 50 wt.% CNT with 1 wt.%.

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“…During the irradiation of the laser, the input energy is first absorbed by graphene or CNTs that results in the partial decomposition of Gr or CNT, followed by their in situ reaction with the Al matrix and consequently the formation of Al 4 C 3 at their interfaces [111]. In addition, when an AMC reinforced with CNTs is subjected to external forces, the oriented CNTs in the loading direction play a key role in the strengthening of the composite [104,116]. Zhou et al [117] used graphene oxide as a reinforcement for AMC production through the LPBF process.…”

Section: Aluminium Matrix Composites (Amcs)mentioning

confidence: 99%

A Comprehensive Overview on the Latest Progress in the Additive Manufacturing of Metal Matrix Composites: Potential, Challenges, and Feasible Solutions

Dadkhah

Mosallanejad

Iuliano

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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Nowadays, as an emerging technology, additive manufacturing (AM) has received numerous attentions from researchers around the world. The method comprises layer-by-layer manufacturing of products according to the 3D CAD models of the objects. Among other things, AM is capable of producing metal matrix composites (MMCs). Hence, plenty of works in the literature are dedicated to developing different types of MMCs through AM processes. Hence, this paper provides a comprehensive overview on the latest research that has been carried out on the development of the powder-based AM manufactured MMCs from a scientific and technological viewpoint, aimed at highlighting the opportunities and challenges of this innovative manufacturing process. For instance, it is documented that AM is not only able to resolve the reinforcement/matrix bonding issues usually faced with during conventional manufacturing of MMCs, but also it is capable of producing functionally graded composites and geometrically complex objects. Furthermore, it provides the opportunity for a uniform distribution of the reinforcing phase in the metallic matrix and is able to produce composites using refractory metals thanks to the local heat source employed in the method. Despite the aforementioned advantages, there are still some challenges needing more attention from the researchers. Rapid cooling nature of the process, significantly different coefficient of expansion of the matrix and reinforcement, processability, and the lack of suitable parameters and standards for the production of defect-free AM MMCs seem to be among the most important issues to deal with in future works.

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Microstructural evaluation and mechanical properties of Al-CNT nanocomposites produced by different processing methods

Cited by 35 publications

References 38 publications

Effect of Reinforcement Type and Dispersion on the Hardening of Sintered Pure Aluminium

Effect of Reinforcement Type and Dispersion on the Hardening of Sintered Pure Aluminium

AL2024 Kompozitlerin Aşınma Karakteristiği

A Comprehensive Overview on the Latest Progress in the Additive Manufacturing of Metal Matrix Composites: Potential, Challenges, and Feasible Solutions

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