Tensile Strength and Electrical Conductivity of Carbon Nanotube Reinforced Aluminum Matrix Composites Fabricated by Powder Metallurgy Combined with Friction Stir Processing

Liu, Z.Y.; Xiao, Bing; Wang, W.G.; Ma, Z.Y.

doi:10.1016/j.jmst.2014.04.016

Cited by 125 publications

(31 citation statements)

References 34 publications

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“…D band is correspond to the distortion of SP 2 structure and G-band arises from the stretching of the C-C bond. When these bands shows red shift (towards lower frequency), it indicates strong C-metallic atom bond formation [23]. Later, Ni easily form metallic bond with aluminium matrix which is much stronger than CNT-Al (metal-non-metal) interfacial bonding.…”

Section: Resultsmentioning

confidence: 99%

Al–CNT–Ni composite with significantly increased strength and hardness

Billah

Chen

2019

SN Appl. Sci.

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In this study, aluminium-carbon nanotube-nickel (Al-CNT-Ni) composite was prepared by powder metallurgy from pure Al powder and Ni-encapsulated CNT. Previously, carbon nanotubes were coated with nickel following ultraviolet-assisted electroless deposition method. Tensile strength and hardness of the composites were found to increase in proportion to the CNTs addition. For an addition of 7 wt.% Ni-coated CNTs containing 2.5 wt.% nanotubes of 8-15 nm diameter (Ni to CNT ratio was 1-0.357), resultant tensile and yield strength were increased by 129.26% and 157.48% respectively compared to pure aluminium. Hardness was also increased by 171.39%. These results were obtained while conventional sintering was followed by further consolidation by Hot Isostatic Pressing (HIP). Enhanced mechanical properties are attributed to the well dispersion of CNTs in aluminium matrix and strong interfacial bonding between CNT and aluminium. Well dispersion of CNTs and strong interfacial bonding was resulted from the uniform Ni-encapsulation as verified by red shift in Raman Spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Al–CNT–Ni composite with significantly increased strength and hardness

Billah

Chen

2019

SN Appl. Sci.

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“…In Liu et al . (,b), the authors demonstrate how carbon nanotubes enhances aluminium matrix properties after FSP. The same increase in strength is observed for SiC reinforcements up to high percentages (Izadi et al ., ).…”

Section: Introductionmentioning

confidence: 87%

“…Rearrangement and localised deformation are enhanced by an increase in the particle size, due to its effect on the local overheating (Diouf & Molinari, ). For this reason, low temperature and high pressure are indicated as optimal combinations in SPS of pure aluminium in order to retain nanostructure in the sintered material (Liu et al ., ,b). Maximum temperature has a direct influence on the sintered materials density (Saheb, ).…”

Section: Introductionmentioning

confidence: 99%

Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

Sadeghi

Cavaliere

Shamanian

et al. 2018

Journal of Microscopy

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In the present study, Spark Plasma Sintered (SPSed) aluminium matrix composites were severely deformed through Friction stir processing (FSP). Pure aluminium powders and bimodal sized Al O particles (80 nm and 25 μm) were firstly mixed by ball milling and then consolidated by spark plasma sintering. The effect of the heat input as well the bimodal particle size of the alumina on the materials' microstructure and texture development was evaluated by electron back scattered diffraction (EBSD) analysis. The EBSD analysis clearly showed that the SPSed nanocomposites possessed bimodal aluminium matrix grain structure as well as a crystallography characterised by random texture. In addition, microstructural examination revealed that the partial recrystallisation occurred during SPS for all the nanocomposites. Also, it is revealed that the Zener pinning effect of Al O nanoparticles retarded recrystallised grain growth following recrystallisation during FSP and then leading to grain refinement of the aluminium. The results revealed that the heat generated during FSP has a remarkable effect on the grain distribution as well as on the crystallographic orientation. Also, a mixture of {112} <110> shear elements and an ideal strong B/B¯ component were observed. The microstructural changes, occurred during FSP in the stir zone region for Al-Al O nanocomposites, were attributed to both the discontinuous along with the continuous recrystallisation (DDRX/CDRX). It should be pointed out that with increasing the heat input, recrystallised grains portion increased.

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“…In this process, a nonconsumable rotating tool containing a shoulder and a pin with specific design and geometry is plunged into the surface to be modified and after frictional heating, which then travels along the specific direction to stir the surrounding area due to the high temperature severe plastic deformation (SPD) caused by extruding the solidified materials from leading to trailing edge (Nandan et al, 2008). Despite the widespread applications of this process for processing of ultrafine grained metals/alloys (Hofmann & Vecchio, 2005;Khodabakhshi et al, 2015a), homogenising powder metallurgy parts (Khodabakhshi et al, 2013;Liu et al, 2014b), and modification of casting products (Mahmoud, 2013), it has only recently attracted significant interest for fabrication of metal matrix nanocomposites (Mishra et al, 2003;Mishra & Ma, 2005;Khodabakhshi et al, 2015e).…”

Section: Introductionmentioning

confidence: 99%

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

Khodabakhshi

Nosko

Gerlich

2018

Journal of Microscopy

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Multipass friction-stir processing was employed to uniformly disperse multiwalled carbon nanotubes (MW-CNTs) within an Al-Mg alloy metal matrix. Decomposition of MW-CNTs occurs in situ as a result of solid-state chemical reactions, forming fullerene (C60) and aluminium carbide (Al C ) phases during reactive high temperature severe plastic processing. The effects of this decomposition on the microstructural features, dynamic restoration mechanisms and crystallographic microtextural developments are studied for the first time by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analysis. The formation of an equiaxed grain structure with an average size of ∼1.5 μm occurs within the stirred zone (SZ) under the influence of inclusions which hinder grain boundary migration via Zener-Smith pinning mechanisms during the discontinuous dynamic recrystallisation (DDRX). Formation of two strong Cubic and Brass microtextural components in the heat affected zone (HAZ) and thermomechanical affected zone (TMAZ) was noted as compared to the completely random and Cube components found in the base and SZ regions, respectively. The microstructural modification led to hardening and tensile strength improvement for the processed nanocomposite by ∼55% and 110%, respectively with respect to the annealed Al-Mg base alloy.

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Tensile Strength and Electrical Conductivity of Carbon Nanotube Reinforced Aluminum Matrix Composites Fabricated by Powder Metallurgy Combined with Friction Stir Processing

Cited by 125 publications

References 34 publications

Al–CNT–Ni composite with significantly increased strength and hardness

Al–CNT–Ni composite with significantly increased strength and hardness

Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

Influence of CNTs decomposition during reactive friction‐stir processing of an Al–Mg alloy on the correlation between microstructural characteristics and microtextural components

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