Strengthening in carbon nanotube/aluminium (CNT/Al) composites

George, Raji; Kashyap, K. T.; Rahul, Rohit; Yamdagni, Sumeet

doi:10.1016/j.scriptamat.2005.07.022

Cited by 733 publications

(329 citation statements)

References 14 publications

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“…Recently, CNTs have been widely used as reinforcing materials for metal matrix composites (MMCs). The previous studies indicated the remarkable characteristics of MMCs reinforced with CNTs, such as aluminium [5][6][7], magnesium [8][9][10], copper [11][12] and titanium [13][14][15][16]. Ti and its alloys are also interested as competitive matrix materials because they exhibit high specific strength which is an important factor for weight reduction of the airplane and automotive applications from the viewpoint of energy consumption.…”

Section: Introductionmentioning

confidence: 99%

High-temperature properties of extruded titanium composites fabricated from carbon nanotubes coated titanium powder by spark plasma sintering and hot extrusion

Kondoh

Threrujirapapong

Umeda

et al. 2012

Composites Science and Technology

107

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Pure titanium matrix composite reinforced with carbon nanotubes (CNTs) was prepared by spark plasma sintering and hot extrusion via powder metallurgy process.Titanium (Ti) powders were coated with CNTs via a wet process using a zwitterionic surfactant solution containing 1.0, 2.0 and 3.0wt.% of CNTs. In-situ TiC formation via reaction of CNTs with titanium occurred during sintering, and TiC particles were uniformly dispersed in the matrix. As-extruded Ti/TiCs composite rods were annealed at 473 K for 3.6 ks to reduce the residual stress during processing. After annealing process, the tensile properties of the composites were evaluated at room temperature, 473, 573 and 673 K, respectively. Hardness test was also performed at room temperature up to 573 K with a step of 50 K. The mechanical properties of extruded Ti/CNTs composites at elevated temperature were remarkably improved by adding a small amount of CNTs, compared to extruded Ti matrix. These were due to the TiC dispersoids originated from CNTs effectively stabilized the microstructure of extruded Ti composites by their pinning effect. Moreover, the coarsening and growth of Ti grain never occurred even though they were annealed at 573, 673 K for 36 ks and 673 K for 360 ks, respectively.

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Section: Introductionmentioning

confidence: 99%

High-temperature properties of extruded titanium composites fabricated from carbon nanotubes coated titanium powder by spark plasma sintering and hot extrusion

Kondoh

Threrujirapapong

Umeda

et al. 2012

Composites Science and Technology

107

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show abstract

“…Previous studies indicated characteristics of the metal matrix composites (MMCs) reinforced with CNTs, where industrial metals such as aluminum, magnesium, nickel, copper and their alloys were used [5][6][7][8][9][10][11][12][13][14]. Titanium (Ti) and titanium alloy are also interested as the matrix material because they are widely used in various industrial applications, for example, automotive, motorcycles, and airplane industries due to their high specific strength and Young's modulus.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of powder metallurgy pure titanium matrix composite reinforced with multi-wall carbon nanotubes

Kondoh

Threrujirapapong

Imai

et al. 2009

Composites Science and Technology

213

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By using pure titanium powder coated with un-bundled multi-wall carbon nanotubes (MWCNTs) via wet process, powder metallurgy (P/M) titanium matrix composite (TMC) reinforced with the CNTs was prepared by spark plasma sintering (SPS) and subsequently hot extrusion process. The microstructure and mechanical properties of P/M pure titanium and reinforced with CNTs were evaluated. The distribution of CNTs and in-situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyzer. The mechanical properties of TMC were significantly improved by the additive of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. 2Fractured surfaces of tensile specimens were analyzed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed.

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“…The factors which influence the mechanical properties are grain size, the interaction between the reinforcements and base metals and dislocation density [4]. The generation of dislocation density was higher at the interface due to large thermal mismatch between the carbon nanotubes and aluminium matrix, which enhances the strengthening of the matrix by work hardening [22]. And the dislocations movement will be hindered by the nanosized carbon nanotubes which were distributed in the matrix.…”

Section: Tensile Strengthmentioning

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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Strengthening in carbon nanotube/aluminium (CNT/Al) composites

Cited by 733 publications

References 14 publications

High-temperature properties of extruded titanium composites fabricated from carbon nanotubes coated titanium powder by spark plasma sintering and hot extrusion

High-temperature properties of extruded titanium composites fabricated from carbon nanotubes coated titanium powder by spark plasma sintering and hot extrusion

Characteristics of powder metallurgy pure titanium matrix composite reinforced with multi-wall carbon nanotubes

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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