Distribution and stability of carbon nanotubes during multi-pass friction stir processing of carbon nanotube/aluminum composites

Izadi, Hossein; Gerlich, A.P.

doi:10.1016/j.carbon.2012.06.012

Cited by 136 publications

(55 citation statements)

References 39 publications

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“…The looping effect of carbon nanotubes could play a vital role in obtaining the abovementioned fine grain microstructure in the composites reinforced with CNTs. Due to their high aspect ratio, carbon nanotubes have been considered as an ideal reinforcing agent in composites such that they are able to be stretched at the grain boundaries hindering the grain growth at different directions [19]. In addition to the presence and hindering effect of CNTs against grain growth, another reason for this phenomenon could be thermal mismatching between the reinforcing agent and the composite matrix [20].…”

Section: Microstructural Evaluationmentioning

confidence: 99%

Mechanical and microstructural characterization of Cu/CNT nanocomposite layers fabricated via friction stir processing

Jafari

Givi

Barmouz

2014

Int J Adv Manuf Technol

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In this study, the effect of incorporation of carbon nanotubes into pure copper was investigated through friction stir processing (FSP). To this end, FSP has been performed using one and three passes. Moreover, the changes in peak temperature of one-pass friction stir processing performed by tools with different shoulder diameters have been recorded. It was found that for the tool with smaller shoulder, the process temperature peak has been significantly reduced. Remarkable reduction in grain size of Cu/carbon-nanotube nanocomposites was observed as compared with the pure copper. Raman spectroscopy results proved a higher extent of degradation of carbon nanotubes upon increasing the friction stir processing passes. On the other hand, microhardness and wear results showed that as the carbon nanotubes are introduced to the pure copper, hardness of composites processed via one-and three-friction stir processing passes showed enhancements of 65 and 105 %, respectively, and the weight losses were also decreased 31 and 68 %, respectively. It was also observed that friction coefficient of one-pass processed composite is lower than that of the pure copper due to the presence of carbon nanotube clusters. Whereas, the friction coefficient of three-pass processed composite was increased regarding to the pure copper. The reduction in slope of wear weight loss upon increasing the applied force at the wear test signified the higher efficiency of the processed composites under harsh conditions.

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Section: Microstructural Evaluationmentioning

confidence: 99%

Mechanical and microstructural characterization of Cu/CNT nanocomposite layers fabricated via friction stir processing

Jafari

Givi

Barmouz

2014

Int J Adv Manuf Technol

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“…For more investigation of the effect of reinforcement hardness on the hardness values of the composite, the rule of mixtures is used as follows [39]:…”

Section: Hardness In the Cross Section Of Surface Compositesmentioning

confidence: 99%

“…From the previous study [39], this simplistic view is a direct way to investigate the strength efficiency of the particles on the A356 alloy. As shown in the above equation, the reinforcement hardness directly influence the composites hardness.…”

Section: Hardness In the Cross Section Of Surface Compositesmentioning

confidence: 99%

The effect of reinforcement type on the microstructure, mechanical properties, and wear resistance of A356 matrix composites produced by FSP

Shojaeefard

Akbari

Asadi

et al. 2016

Int J Adv Manuf Technol

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Fabrication of particle-reinforced aluminum matrix composites has been pursued with a keen interest recently. However, a comparison of the effect of different reinforcements on the mechanical properties and wear resistance of A356 matrix composites fabricated by FSP is of great interest to be considered. In the present work, the microstructural, mechanical, and wear properties of A356 matrix composites reinforced by SiC, TiC, ZrO 2 , and B 4 C particles are investigated. Moreover, the effect of pin profile on distribution of reinforcing particles in the stir zone of the FSPed specimens is investigated. Hardness and wear tests are performed in order to investigate mechanical and wear properties of the composites. The composite reinforced by TiC particles exhibits higher hardness value compared with other reinforcements due to the excellent bonding between TiC and metal matrix as well as higher hardness value of reinforcement itself than other reinforcements. Moreover, wear test results show that the wear resistance of the composite is significantly improved compared with that of the base metal.

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“…Lim et al [12] reported the synthesis of multi-walled CNT reinforced aluminium alloy composite with a groove of 0.3depth and 2.3mm width by friction stir processing, in which the hardness of the joint was improved. Izadi et al [13] studied the multi-pass FSP of AA5059 alloy by inserting the carbon nanotubes of mean diameter 30-50nm in to the groove of size 2.5mm in width and 1.8mm in depth. After three passes the reinforcements were distributed uniformly in the stir zone of the nanocomposite which restricted the grain size and yielded higher microhardness.…”

Section: Introductionmentioning

confidence: 99%

Effect of Welding Speed on Microstructure and Mechanical Properties due to The Deposition of Reinforcements on Friction Stir Welded Dissimilar Aluminium Alloys

Baridula

Faizal

Ramaraju³

et al. 2017

MATEC Web Conf.

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The strength of the welded joint obtained by solid state stir welding process was found to be improved as compared to fusion welding process. The deposition of reinforcements during friction stir welding process can further enhance the strength of the welded joint by locking the movement of grain boundaries. In the present study, the aluminium alloys AA2024 and AA7075 were welded effectively by depositing the multi-walled carbon nanotubes in to the stir zone. The mechanical properties and microstructures were studied by varying the traverse speed at constant rotational speed. The results show that rotating tool pin stirring action and heat input play an important role in controlling the grain size. The carbon nanotubes were found to be distributed uniformly at a welding speed (traverse speed) of 80mm/min. This enhanced the mechanical properties of the welded joint. The microstructure and Electron dispersive X-ray analysis (EDX) studies indicate that the deposition of carbon nanotubes in the stir zone was influenced by the traverse speed.

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Distribution and stability of carbon nanotubes during multi-pass friction stir processing of carbon nanotube/aluminum composites

Cited by 136 publications

References 39 publications

Mechanical and microstructural characterization of Cu/CNT nanocomposite layers fabricated via friction stir processing

Mechanical and microstructural characterization of Cu/CNT nanocomposite layers fabricated via friction stir processing

The effect of reinforcement type on the microstructure, mechanical properties, and wear resistance of A356 matrix composites produced by FSP

Effect of Welding Speed on Microstructure and Mechanical Properties due to The Deposition of Reinforcements on Friction Stir Welded Dissimilar Aluminium Alloys

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