Enhanced mechanical properties of aluminum based composites reinforced by chemically oxidized carbon nanotubes

Guo, Baisong; Zhang, Xinming; Cen, Xi; Chen, Biao; Wang, Xinhua; Song, Min; Ni, Song; Yi, Jianhong; Shen, Tao; Du, Yong

doi:10.1016/j.carbon.2018.07.026

Cited by 89 publications

(17 citation statements)

References 61 publications

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“…The demand for Al-based metal matrix composites (AMMCs) will continue increasing at unstoppable rates due to development in the automotive and construction industry. Improvement in the strength of aluminum alloys can be achieved by uniformly distributed hard materials such as oxides [1,2], borides [3], carbides [4], graphene [5,6] or carbon nanotubes [7,8]. However, wetting problems arise and microparticles severely degrade the plasticity and machinability of metals [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Oxide and Ethanol Surface Layer on Phase Transformation of Al-Based Nanocomposite Powders under High-Energy Milling

Janovszky

2019

Materials

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Pure Al particles reinforced with amorphous-nanocrystalline Cu36Zr48Ag8Al8 particles composite powders were prepared by high-energy milling without and with ethanol. The mechanical milling procedures were compared so that in the case of dry milling the particle size increased owing to cold welding, but the crystallite size decreased below 113 nm. The amorphous phase disappeared and was not developed until 30 h of milling time. Using ethanol as a process control agent, the particle size did not increase, while the amorphous fraction increased to 15 wt.%. Ethanol decomposed to carbon dioxide, water, and ethane. Its addition was necessary to increase the amount of the amorphous structure.

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Section: Introductionmentioning

confidence: 99%

Influence of the Oxide and Ethanol Surface Layer on Phase Transformation of Al-Based Nanocomposite Powders under High-Energy Milling

Janovszky

2019

Materials

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“…Second, the improved interfacial strength of Ag@CNTs and the embedding distribution can inhibit the matrix deformation. The uniform dispersion of Ag@CNTs within grain boundaries can also inhibit nucleation and motion of dislocation to a greater extent, leading to the improvement of mechanical properties [23]. The results demonstrated that the significant increase in hardness was derived from the uniform distribution of Ag@CNTs in the Ag matrix, and the interface strength of the CNT-Ag interface.…”

Section: Resultsmentioning

confidence: 99%

“…First, the strengthening mechanism of CNT reinforcement is believed to be related to the unique structural characteristics and the excellent mechanical properties of CNTs, as well as the good bonding interfaces between the CNTs and the Ag matrix. Additionally, compared with graphite, CNTs have high aspect ratios and a large specific surface area, and are therefore expected to have more of an impact on restraining the dislocation motion and propagation during tensile testing [23]. Finally, the CNT clusters generated a large number of pores, which led to crack propagation during tensile testing.…”

Section: Resultsmentioning

confidence: 99%

A Comparison Study of Ag Composites Prepared by Spark Plasma Sintering and Hot Pressing with Silver-Coated CNTs as the Reinforcements

Dong-ming

Gan

et al. 2019

Materials

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In this study, carbon nanotube-reinforced silver composites (CNT/Ag) were prepared by the powder metallurgy process via spark plasma sintering (SPS) and hot pressing sintering (HP) with composite powders through an improved electroless plating method assisted by ultrasonic spray atomization. The dispersion of CNTs was effectively improved by ultrasonic spray atomization, and uniform silver layers were deposited on the surface of CNTs by electroless deposition. The property testing results showed significant improvements of the electrical conductivity, hardness, and tensile strength in the samples prepared by SPS, as compared to their HP sintered counterparts. When the volume fraction of CNTs reached 2.5%, the tensile strength reached a maximum value of 221 MPa, which was more than twice that of the pure silver samples. The structural analysis indicated different degrees of CNT agglomeration and matrix mean grain sizes in the composites prepared by SPS and HP, which are responsible for the differences in properties.

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“…Undesirable products at interfaces leading to degradation of the reinforcement are another important problem in the technology of producing composites with carbon nanotubes [14]. The following approaches have been used to solve the indicated problem: the surface modification of nanotubes by chemical oxidation [15], direct in situ synthesis of carbon nanotubes on aluminum powder particles [16], and controlled formation of an aluminum carbide layer at the Al/CNT interface [17]. Hybridization of the reinforcement through the formation of nanosized particles or continuous coatings on the CNT surfaces, which appear as an interphase barrier layer at the Al/CNT interface, can significantly increase adhesion with the matrix and contribute to a more efficient load redistribution, which ensures a higher level of mechanical properties [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Increasing the Strength of Aluminum Matrix Nanocomposites Reinforced with Microadditions of Multiwalled Carbon Nanotubes Coated with TiC Nanoparticles

et al. 2019

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Aluminum matrix composites reinforced with multiwalled carbon nanotubes (MWCNTs) are promising materials for applications in various high-tech industries. Control over the processes of interfacial interaction in Al/MWCNT composites is important to achieve a high level of mechanical properties. The present study describes the effects of coating MWCNTs with titanium carbide nanoparticles on the formation of mechanical properties and the evolution of the reinforcement structure in bulk aluminum matrix nanocomposites with low concentrations of MWCNTs under conditions of solid-phase consolidation of ball-milled powder mixtures. Using high-energy ball milling and uniaxial hot pressing, two types of bulk nanocomposites based on aluminum alloy AA5049 that were reinforced with microadditions of MWCNTs and MWCNTs coated with TiC nanoparticles were successfully produced. The microstructural and mechanical properties of the Al/MWCNT composites were investigated. The results showed that, on the one hand, the TiC nanoparticles on the surface of the MWCNT hybrid reinforcement reduced the damage of reinforcement under the intense exposure of milling bodies, and on the other hand, they reduced the contact area of the MWCNTs with the matrix material (acting as a barrier interface), which also locally inhibited the reaction between the matrix and the MWCNTs.

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Enhanced mechanical properties of aluminum based composites reinforced by chemically oxidized carbon nanotubes

Cited by 89 publications

References 61 publications

Influence of the Oxide and Ethanol Surface Layer on Phase Transformation of Al-Based Nanocomposite Powders under High-Energy Milling

Influence of the Oxide and Ethanol Surface Layer on Phase Transformation of Al-Based Nanocomposite Powders under High-Energy Milling

A Comparison Study of Ag Composites Prepared by Spark Plasma Sintering and Hot Pressing with Silver-Coated CNTs as the Reinforcements

Effect of Increasing the Strength of Aluminum Matrix Nanocomposites Reinforced with Microadditions of Multiwalled Carbon Nanotubes Coated with TiC Nanoparticles

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