Laser additive manufacturing of carbon nanotubes (CNTs) reinforced aluminum matrix nanocomposites: Processing optimization, microstructure evolution and mechanical properties

Gu, Dongdong; Xiangwei, Rao; Dai, Donghua; Ma, Chenglong; Xi, Lixia; Lin, Kaijie

doi:10.1016/j.addma.2019.100801

Cited by 52 publications

(43 citation statements)

References 36 publications

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“…Introducing nano reinforcements, such as nanoparticle, nanorod and nanosheet, is an effective way to improve the mechanical properties of metal materials [ [12] , [13] , [14] ]. The possible strengthening mechanism mainly includes (i) grain refinement, (ii) load-transfer effect, (iii) Orowan strengthening, and (iv) thermal expansion differences between the matrix and reinforcements [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold

Yang

Cheng

Peng

et al. 2021

Bioactive Materials

145

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Zinc (Zn) possesses desirable degradability and favorable biocompatibility, thus being recognized as a promising bone implant material. Nevertheless, the insufficient mechanical performance limits its further clinical application. In this study, reduced graphene oxide (RGO) was used as reinforcement in Zn scaffold fabricated via laser additive manufacturing. Results showed that the homogeneously dispersed RGO simultaneously enhanced the strength and ductility of Zn scaffold. On one hand, the enhanced strength was ascribed to (i) the grain refinement caused by the pinning effect of RGO, (ii) the efficient load shift due to the huge specific surface area of RGO and the favorable interface bonding between RGO and Zn matrix, and (iii) the Orowan strengthening by the homogeneously distributed RGO. On the other hand, the improved ductility was owing to the RGO-induced random orientation of grain with texture index reducing from 20.5 to 7.3, which activated more slip systems and provided more space to accommodate dislocation. Furthermore, the cell test confirmed that RGO promoted cell growth and differentiation. This study demonstrated the great potential of RGO in tailoring the mechanical performance and cell behavior of Zn scaffold for bone repair.

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Section: Introductionmentioning

confidence: 99%

Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold

Yang

Cheng

Peng

et al. 2021

Bioactive Materials

145

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“…SLM process usually involves high temperature, the laser energy is first absorbed by CNTs, part of the CNTs are decomposed into carbon atoms in the molten pool. As the temperature in the molten pool is high, the Marangoni flow increases and leads to the vibration of the melt, which promotes the diffusion of carbon atoms and thus increases the nucleation rate of Al 4 C 3 [ 29 ]. The in situ reaction occurred at the interface between CNTs and the Al matrix, and the Al 4 C 3 was formed on the outer layer of the CNTs.…”

Section: Resultsmentioning

confidence: 99%

“…CNTs cannot be used as a nucleation site for Al [28], so the CNTs is squeezed to the grain boundaries and maintained its tubular structure. However, CNTs will have many crystallographic defects during the ball milling process, which will reduce the stability of CNTs at a high temperature [29]. SLM process usually involves high temperature, the laser energy is first absorbed by CNTs, part of the CNTs are decomposed into carbon atoms in the molten pool.…”

Section: Microstructurementioning

confidence: 99%

Investigation on the Microstructure and Mechanical Properties of CNTs-AlSi10Mg Composites Fabricated by Selective Laser Melting

Luo

et al. 2021

Materials

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CNT-AlSi10Mg composites fabricated by SLM have drawn a lot attention in structural application due to its excellent strength, elasticity and thermal conductivities. A planetary ball milling method was used to prepare the carbon nanotube (CNT)-AlSi10Mg powders, and the CNT-AlSi10Mg composites were fabricated by selective laser melting (SLM). The density, microstructure and mechanical properties of CNT-AlSi10Mg composites were studied. The density of the test samples increased at first and then decreased with increasing scan speed. When the laser scan speed was 800 mm/s, the test sample exhibited the highest density. The hardness increased by approximately 26%, and the tensile strength increased by approximately 13% compared to those values exhibited by the unreinforced AlSi10Mg. The grains of CNT-AlSi10Mg composite are finer than that in the AlSi10Mg. The CNTs were distributed along the grain boundaries of AlSi10Mg. Some of the CNTs reacted with Al element and transformed into Al4C3 during SLM, while some of the CNTs still maintained their tubular structure. The combination of CNTs and Al4C3 has a significant improvement in mechanical properties of the composites through fine grain strengthening, second phase strengthening, and load transfer strengthening.

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“…As a result of this coexistence of reinforcement and the fine second phase, the microstructure of AMCs turns from the columnar to equiaxed or to the columnar with a small aspect ratio (Fig. 5) [111].…”

Section: Aluminium Matrix Composites (Amcs)mentioning

confidence: 99%

“…In another work, Gu et al [111] studied the microstructure and mechanical properties of AlSi10Mg/CNTs composites produced via the LPBF process. They found that by increasing the laser scanning speed, the microstructure of the AMC reinforced by CNTs transformed from the coarse columnar crystals to the equiaxed ones.…”

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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Laser additive manufacturing of carbon nanotubes (CNTs) reinforced aluminum matrix nanocomposites: Processing optimization, microstructure evolution and mechanical properties

Cited by 52 publications

References 36 publications

Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold

Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold

Investigation on the Microstructure and Mechanical Properties of CNTs-AlSi10Mg Composites Fabricated by Selective Laser Melting

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

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