Effect of nano TiO2 particles on microhardness and microstructural behavior of AA7068 metal matrix composites

Joshua, K. John; Vijay, S.J.; Selvaraj, D. Philip

doi:10.1016/j.ceramint.2018.08.077

Cited by 51 publications

(24 citation statements)

References 30 publications

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“…Spherical shaped pores are evident from the worn surfaces. Pores present are likely to occur in powder metallurgy compared to the liquid melting route which may be due to reduced compaction pressure applied or different sintering parameters [20]. Figure 5d demonstrates the FESEM micrograph of AA7068-9% SiC composite.…”

Section: Wear Behaviormentioning

confidence: 99%

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Joshua¹,

Ramkumar

Vijay

et al. 2020

Lecture Notes in Mechanical Engineering

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If anybody is missing any arm or leg, a prosthetic limb can be replaced to take care of their activities by themselves. Manufacturing of prosthetic limbs for such persons should be lightweight and requires improved hardness. Hence, silicon carbide (SiC) was incorporated into aluminum alloy (AA7068) to produce composites by powder metallurgy technique with different weight percentages of SiC (3, 6 and 9%) along with base alloy. A compaction pressure of 318 MPa was applied and sintered at a temperature of 560°C for an hour. Vickers microhardness test was carried out to find out the microhardness values. Wear experiments were conducted with a velocity of 1.2 m/s over a sliding distance of 2.5 km of load 5 N. Field emission scanning electron microscopy (FESEM) analysis was carried out to investigate the worn surface. Experimental results showed that the Vickers microhardness number has been increased to a maximum of 55 VHN by the addition of 9% SiC particles which were 66.7% more than the base alloy. Wear experiments exposed an improved wear resistance by the addition of SiC particles. AA7068-9% SiC composite exhibited maximum wear resistance. FESEM analysis revealed that abrasion and oxidation were the predominant wear modes for the produced AA7068/SiC composites. The prosthetic limb produced using such composite combination would be lightweight with the improved hardness which would serve the persons better to perform their daily activities.

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Section: Wear Behaviormentioning

confidence: 99%

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Joshua¹,

Ramkumar

Vijay

et al. 2020

Lecture Notes in Mechanical Engineering

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“…The composites of AA7068 reinforced with different weight percentages of graphite (3, 6, 9%) along with plain AA7068 were produced. The produced composites were polished using 600, 800 and 1200 abrasive grit paper and with 2 µm and 0.5 µm diamond paste in twin disk polisher and etched in Keller's reagent for 10 s for cleaning [19]. Three spots were spotted and the average values were taken for measuring the Vickers microhardness.…”

Section: Composite Preparationmentioning

confidence: 99%

Influence of Graphite Particles on Microhardness and Microstructural Behavior of AA7068 Metal Matrix Composites Processed by Powder Metallurgy

Joshua¹,

Vijay

Ramkumar

et al. 2020

Lecture Notes in Mechanical Engineering

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Automotive industries require components such as automotive shock absorbers that should be lightweight and has to withstand high wear resistance. Monolithic aluminum alloys is not enough to meet the demands. Hence aluminum alloy (AA7068) reinforced with graphite particles were processed by powder metallurgy technique with different weight percentages of graphite (3, 6, and 9%) along with base matrix. A low pressure of 318 MPa was applied for compaction and sintered at a temperature of 560°C for one hour. Vickers microhardness test was carried out for measuring the microhardness of the composites. Using pin-on-disc wear-tester, wear experiments were conducted with a velocity of 1.2 m/s over a sliding distance of 2.5 km of load 5 N. Field Emission Scanning Electron Microscopy (FESEM) analysis was carried out to investigate the worn surface. Experimental results showed that the Vickers microhardness number has been reduced to 19 VHN by the addition of 9% graphite particles. Wear experiments revealed improved wear resistance by the addition of graphite particles. FESEM analysis exposed that abrasion, delamination, and oxidation were the dominant wear mechanisms for the composites. The automotive shock absorber produced using such a composite combination would be lightweight with improved wear resistance.

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“…The fabrication techniques and reinforcement properties have a vital role in deciding the physical and mechanical behavior of composites. [1][2][3][4] The addition of reinforcements into the matrix material enhances the properties of materials, but the particle content decides the mechanical properties of the composites. However, the excessive inclusion of particles leads to the porosity and also the particle agglomeration within the metal matrix.…”

Section: Introductionmentioning

confidence: 99%

The effect of machining processes on the physical and surface characteristics of AA2024-B₄C-SiC hybrid nanocomposites fabricated by hot pressing method

Çevik

Karabacak

Kök

et al. 2021

Journal of Composite Materials

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In this study, an attempt was made on the AA2024 alloy based hybrid nanocomposites reinforced with different weight percentage of SiC and B4C particles to investigate their physical and machinability characteristics including surface morphology. The Material Removal Rate (MRR), Surface Roughness (SR) of the nanocomposites machined by various machining processes namely Abrasive Water Jet (AWJ) machining, Wire Electrical Discharge (WED) machining and Computer Numerical Controlled (CNC) turning processes were studied comparatively. The machined surface formed by the each machining process is examined and its surface quality was discussed for each hybrid nanocomposite. Results show that the hardness is increased to 101.6 BHN from 179.4 BHN, when 2 wt.% of B4C and SiC particles is added to AA2024 matrix. Observed from the results that the addition of 2 wt.% of B4C and SiC particles produces the highest porosity of 3.36% for nanocomposite samples. The experimental results revealed that the addition of particulates in to the matrix reduces the MRR and increases SR. MRR results showed that hybrid nanocomposites machined by AWJ technique has minimum MRR of 0.0221 mm3/min. The surface roughness of the nanocomposites machined with AWJ process was 3.2 µm and increased to 6.81 µm for the AA2024-B4C-SiC hybrid nanocomposites machined with CNC process.

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Effect of nano TiO2 particles on microhardness and microstructural behavior of AA7068 metal matrix composites

Cited by 51 publications

References 30 publications

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Influence of Graphite Particles on Microhardness and Microstructural Behavior of AA7068 Metal Matrix Composites Processed by Powder Metallurgy

The effect of machining processes on the physical and surface characteristics of AA2024-B₄C-SiC hybrid nanocomposites fabricated by hot pressing method

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Effect of nano TiO2 particles on microhardness and microstructural behavior of AA7068 metal matrix composites

Cited by 51 publications

References 30 publications

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Microhardness and Microstructural Behavior of AA7068/SiC Metal Matrix Composites Synthesized by Powder Metallurgy

Influence of Graphite Particles on Microhardness and Microstructural Behavior of AA7068 Metal Matrix Composites Processed by Powder Metallurgy

The effect of machining processes on the physical and surface characteristics of AA2024-B4C-SiC hybrid nanocomposites fabricated by hot pressing method

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The effect of machining processes on the physical and surface characteristics of AA2024-B₄C-SiC hybrid nanocomposites fabricated by hot pressing method