Mechanical and Tribological Behavior of Multiwalled Carbon Nanotubes-Reinforced AA7075 Composites Prepared by Powder Metallurgy and Hot Extrusion

Jagannatham, M.; Saravanan, M.; Sivaprasad, K.; Babu, S.P. Kumaresh

doi:10.1007/s11665-018-3681-3

Cited by 18 publications

(17 citation statements)

References 49 publications

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“…Plowing marks were observed on the worn surface at the initial stage later delamination. The amount of debris obtained is less in CNTs reinforced composites [20]. The adhesion and ploughing are caused wear, the delamination is the important wear mechanism in Al-Si material is shown in figure 14(f) [27,28].…”

Section: Dry Sliding Wear Experimentsmentioning

confidence: 98%

“…The solid self-lubrication layer avoids the contact of pin and disk and due to easy roll or slipping of detached MWCNTs in the contact zone minimizes the worn particle adhesion [6,12,19]. The agglomeration percentage is more at 1.0 wt% MWCNTs nanocomposites in compare to 0.75 wt%, which increases the wear rate [20].…”

Section: Dry Sliding Wear Experimentsmentioning

confidence: 99%

“…The wear decreased with the increment of sliding duration is noticed [14]. The hot extrusion process resulted in better densification and a strong bond between the matrix and reinforcement to minimizes the wear rate [20]. Resistance to wear reduced even though the hardness increased with the MWCNTs addition due to the reduced bond with the matrix and more agglomeration of the reinforcement [21].…”

Section: Dry Sliding Wear Experimentsmentioning

confidence: 99%

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Dry sliding wear characteristics of multi-walled carbon nanotubes reinforced Al-Si (LM6) alloy nanocomposites produced by powder metallurgy technique

Shivaramu¹,

U²,

Umashankar³

2020

Mater. Res. Express

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The present work involved the production of Metal Matrix Composites (MMCs) of Aluminium Silicon (Al-Si) alloy reinforced with Multi Walled Carbon Nano Tubes (MWCNTs) using Powder Metallurgy (PM) process. MWCNTs with concentrations of 0, 0.25, 0.5, 0.75 and 1.0 wt% were used. Validation of dispersion nature, existence and chemically stable of MWCNTs carried out using Transmission Electron Microscope (TEM), X-ray Diffractometer (XRD) and Energy Dispersive Spectrum (EDS) for fabricated composites. Sliding wear investigations were investigated in accordance with the ASTM G99-95a standard. Test variables such as sliding distance, load and speed were examined. Under a given load with sliding distance, the wear rate was found to reduce by varying disc rotation speed between 250 to 750 rpm. The rate of wear is dropped suddenly with the increment in sliding distance from 500 m to 1000 m. However, for 1500 m sliding distance, the wear rate increased linearly for all nanocomposites. The reinforcement of 0.25 wt% and 0.5 wt% of MWCNTs shown lower wear resistance and further addition of 0.75 wt% MWCNTs shown enhanced wear resistance but the addition of reinforcement of above 0.75 wt% resulted in slightly higher wear rate. The wear resistance enhanced due to the excellent properties of reinforcement particles. The Scanning Electron Microscope (SEM) was used for identifying the kind of wear mechanism.

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Section: Dry Sliding Wear Experimentsmentioning

confidence: 98%

Section: Dry Sliding Wear Experimentsmentioning

confidence: 99%

Section: Dry Sliding Wear Experimentsmentioning

confidence: 99%

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Dry sliding wear characteristics of multi-walled carbon nanotubes reinforced Al-Si (LM6) alloy nanocomposites produced by powder metallurgy technique

Shivaramu¹,

U²,

Umashankar³

2020

Mater. Res. Express

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“…AA7075, an important 7xxx series alloy with zinc as major constituent has large number of applications in aerospace and automobile industries due to its high strength to weight ratio, high fatigue resistance, and high compressive strength. [5][6][7] The potential of this alloy has been widely utilized for the development of components like gears, shafts, and aircraft fittings. 5,8 However, poor tribological characteristics are shown by AA7075.…”

Section: Introductionmentioning

confidence: 99%

Tribological characteristics of AA7075 composites reinforced with rice husk ash and carbonized eggshells

Gupta

Singh

Mishra

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper investigates dry sliding friction and wear behavior of AA7075 composites reinforced with rice husk ash and carbonized eggshells. Composites with varying weight percentages of rice husk ash and carbonized eggshells in the range of 0–5 wt.% were fabricated through stir-casting technique. Density, porosity content, and microhardness were computed before tribological testing. Friction and wear tests were conducted on pin-on-disc type tribometer at room temperature. The samples were tested at different loads (10–50 N) with constant speed of 1 m/s and constant sliding distance of 1500 m. Samples were also tested at different sliding speeds (3 and 5 m/s) with constant normal load of 30 N. The addition of natural reinforcements decreased the density of composites. Microhardness of sample having 5 wt% rice husk ash increased by 15.08% over base composition. Maximum wear resistance was shown by sample with 5 wt% rice husk ash. Highest coefficient of friction was shown by sample with 3.75 wt% rice husk ash and 1.25 wt% carbonized eggshells. Wear loss varied directly with increasing load and sliding speeds for all composites, whereas coefficient of friction increased with increasing load and decreased with increasing sliding speed for all composites. Delamination and ploughing are dominant wear mechanisms at low speed whereas ploughing is the dominant wear mechanism at high speed as depicted by scanning electron microscopic images of worn surfaces. Composites with improved wear-resistant properties can be used for different tribological applications particularly in automotive industry.

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“…In order to improve the nanotubes' dispersion, a sonication stage in isopropyl alcohol was previously performed. Jagannatham et al [23] have prepared composites with different amounts of reinforcements, following a conventional sintering and hot extrusion route. They observed that the mechanical and tribological properties of the composites were enhanced with the addition of 1 wt.%, but further addition of CNTs led to a decrease in the performance.…”

Section: Introductionmentioning

confidence: 99%

MWCNT-Reinforced AA7075 Composites: Effect of Reinforcement Percentage on Mechanical Properties

Feijoó

Peña

Cabeza

et al. 2021

Metals

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Metal–matrix composites (MMC) of aluminium alloy 7075 (AA7075) containing 1 wt.% and 0.5 wt.% multiwall carbon nanotubes (MWCNTs) were developed by powder metallurgy, using a high energy ball milling (HEBM) process for dispersion of the MWCNTs. The powder of the AA7075-MWCNT obtained was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microstructural changes produced during the milling process, such as the modification of the crystallite size, as well as the micro-deformation of the matrix crystal lattice, were determined using the Scherrer formula. After consolidation into a strip shape using the hot powder extrusion (HPE) process at 500 °C, no porosity was detected and a fine homogeneous dispersion of the reinforcement into the matrix was obtained. After performing a 0.2 HV test and tensile tests in the extruded profiles of both composites, a better combination of properties was found in samples of AA7075-0.5 wt.% MWCNT, with the increase in measured ductility being especially remarkable.

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Mechanical and Tribological Behavior of Multiwalled Carbon Nanotubes-Reinforced AA7075 Composites Prepared by Powder Metallurgy and Hot Extrusion

Cited by 18 publications

References 49 publications

Dry sliding wear characteristics of multi-walled carbon nanotubes reinforced Al-Si (LM6) alloy nanocomposites produced by powder metallurgy technique

Dry sliding wear characteristics of multi-walled carbon nanotubes reinforced Al-Si (LM6) alloy nanocomposites produced by powder metallurgy technique

Tribological characteristics of AA7075 composites reinforced with rice husk ash and carbonized eggshells

MWCNT-Reinforced AA7075 Composites: Effect of Reinforcement Percentage on Mechanical Properties

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