Effect of extrusion ratio on wear behaviour of hot extruded Al6061–SiCp (Ni–P coated) composites

Ramesh, C.S.; Keshavamurthy, R.; Naveen, G. J.

doi:10.1016/j.wear.2010.12.078

Cited by 49 publications

(22 citation statements)

References 14 publications

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“…The increase in wear loss can be mainly attributed to the destruction of the mechanically mixed layer (MML) formed and material softening due to the increased temperature with increased sliding velocity. Furthermore, increase in wear loss at higher sliding velocity was due to increased strain rate in deformed subsurface [37]. …”

Section: Effect Of Sliding Velocity On Wear Lossmentioning

confidence: 94%

“…It indicated that the oxide debris development was there on the worn surface at dry sliding conditions. During dry sliding of the nanocomposites on the hard steel disc (EN31) counter surface, heat was generated due to the friction which led to the rise of temperature [37]. The combination of temperature rise and environmental reaction caused the formation of the oxide debris at pin and disc contact surfaces [41].…”

Section: Edx Spectrum Analysismentioning

confidence: 99%

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Dry sliding wear behaviour of ultrasonically-processed AA6061/SiCp nanocomposites

Reddy¹,

Krishna²,

Rao³

2017

Int. J. Automot. Mech. Eng.

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The present study focused on the wear performance of AA6061/ SiCp (1, 1.5 and 2 wt. %) of nanocomposites at dry sliding condition. The nanocomposite specimens were fabricated through ultrasonic assisted stir casting technique. The wear experiments were conducted under normal atmospheric conditions using a pin-on-disc apparatus. Three different applied normal loads on nanocomposite pin (10 N, 15 N, and 20 N); at various sliding velocities of (1 m/s, 1.5 m/s, and 2 m/s); and at sliding distances of (1000 m, 2000 m, and 3000 m) were considered. The influences of applied normal load on nanocomposite pin, wt. % of SiCp reinforcement particles, sliding velocity, and sliding distance on both friction coefficient and wear loss were studied. The changes of wear loss and friction coefficient with varying applied normal loads, sliding velocities, and sliding distances were plotted. It was observed that the wear loss increased linearly with increasing sliding distance and sliding velocity. This was due to the increase of oxidation layer on the pin surface. The average friction coefficient at sliding velocity 1 m/s for 1 wt. % of SiCp, 1.5 wt. % of SiCp, and 2 wt. % of SiCp reinforced nanocomposites at sliding distance 3000 m, at 20 N normal loads was 0.29, 0.43, and 0.46, respectively. The average friction coefficient at 2 m/s sliding velocity for the same load and sliding distance was 0.26, 0.27, and 0.28, respectively. The increase of SiCp reinforcement in the matrix increased the friction coefficient due to its cubic crystal structure. The increase of sliding velocity and sliding distances reduced the friction coefficient. The worn surfaces of the samples were examined using SEM and EDX analyses. SEM micrograph analysis of the wear surfaces of the nanocomposites exhibited the abrasion wear and oxidative wear with severe plastic deformation. The shallower scratches, circular grooves, and deeper grooves were identified at different conditions on the worn surfaces.

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Section: Effect Of Sliding Velocity On Wear Lossmentioning

confidence: 94%

Section: Edx Spectrum Analysismentioning

confidence: 99%

Dry sliding wear behaviour of ultrasonically-processed AA6061/SiCp nanocomposites

Reddy¹,

Krishna²,

Rao³

2017

Int. J. Automot. Mech. Eng.

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“…Gr is a solid lubricant that smears the contact surfaces. This ability reduces metal-to-metal contact between the rubbing surfaces and helps in the formation of a surface layer at the interface [67][68][69]. Therefore, Al/SiC/Gr composites exhibit lower friction coefficient and lower wear rate compared with Al/SiC composites.…”

Section: Friction Coefficientmentioning

confidence: 99%

Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

Singh

2016

Friction

121

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Improvement in surface properties and retainment of bulk properties are essential requirements for the design of components for wear resistance applications. This paper summarizes various features of Al/SiC/Gr hybrid composites that can be employed in different tribological applications. The study has revealed that the processing route plays a significant role in obtaining a homogeneous structure of these composites. In powder metallurgy, the selection of sizes of the matrix and reinforcement powders is crucial, whereas the wettability between the reinforcement particles and molten alloy is a major challenge in liquid metallurgy. The incorporation of SiC particles increases the mechanical strength and wear performance of Al composites. However, ejection of these particles can reduce the wear performance of Al composites under severe conditions. The addition of Gr particles helps in the formation of a thick and extensive tribolayer on the wear surface. This layer reduces direct contact between the rubbing surfaces, thereby decreasing the wear rate under certain conditions. Morphological analysis of worn surfaces has confirmed that the hybrid composites exhibit superior wear properties than the pure Al alloy and the ceramic-reinforced composite. However, increase in the Gr content beyond a limiting value can deteriorate the tribological properties of these composites. Therefore, true optimization of a tribosystem (of the hybrid composite and counterface) can be achieved by selecting appropriate reinforcement contents.

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“…Figure 6a shows there exists 35-40% of improvement of hardness in the material after extrusion prepared by the above procedure. It can also be attributed to the higher dislocation density around the reinforcement particles due to the difference of mechanical property and thermal mismatch (Ozdemir and Toparli 2003;Ramesh et al 2011). The mismatch of the properties between the matrix and reinforcements causes the storage of large internal and thermal stress and engenders improved mechanical properties.…”

Section: Micro-hardnessmentioning

confidence: 99%

Synthesis and characterisation of hot extruded aluminium-based MMC developed by powder metallurgy route

Mohapatra

Maity

2017

Int J Mech Mater Eng

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Background: Improvement of the mechanical and tribological properties due to extrusion can be attributed to the improved density and excellent bond strength due to high compressive stress. Methods: To avoid the product defects mathematically contoured cosine profiled die was used for the thermomechanical treatment. Improvement of mechanical characterization like density, hardness, compression test and three-point-bend test was inquired. Two body dry sliding wear behaviour of the prepared AMCs before and after extrusion were investigated by using a pin-on-disc wear testing method by varying the variable parameters like load (N), track diameter (mm) and RPM of the counter disc. Results: The effect of hot extrusion on mechanical and tribological characteristics of aluminium matrix composites (AMCs) developed by powder metallurgy route followed by double axial cold compaction and controlled atmospheric sintering was studied. Conclusion: Shearing of the fine distributed graphite particles at the tribosurface acts as a solid lubricant and decreases wear rate. At higher loading and sliding velocity condition a mixed type of wear mechanism was observed.

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Effect of extrusion ratio on wear behaviour of hot extruded Al6061–SiCp (Ni–P coated) composites

Cited by 49 publications

References 14 publications

Dry sliding wear behaviour of ultrasonically-processed AA6061/SiCp nanocomposites

Dry sliding wear behaviour of ultrasonically-processed AA6061/SiCp nanocomposites

Fabrication characteristics and tribological behavior of Al/SiC/Gr hybrid aluminum matrix composites: A review

Synthesis and characterisation of hot extruded aluminium-based MMC developed by powder metallurgy route

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