Mechanical Fractography and Worn Surface Analysis of Nanographite and ZrO2-Reinforced Al7075 Alloy Aerospace Metal Composites

Kumar, Rajiv; Deshpande, R.G.; Gopinath, B.; Harti, Jayasheel I.; Nagaral, Madeva; Auradi, V.

doi:10.1007/s11668-020-01092-5

Cited by 20 publications

(8 citation statements)

References 17 publications

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“…Moreover, wear is mild oxidative at lower load and changed to metallic wear at high load values. Many authors in literature have observed similar kinds of behavior between wear loss and normal load for AA5052/zirconium diboride, AA7075/molybdenum disulfide/tri silicon tetranitride, and aluminum/silicon carbide/molybdenum disulfide composites respectively [2,23,40,41,42].…”

Section: Effect Of Normal Loadmentioning

confidence: 66%

Synthesis and wear characterization of Al7075/molybdenum disulfide/zirconium diboride hybrid composites

Dubey,

Kumar,

Mohan

2024

Materialwissenschaft Werkst

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The manuscript presents the synthesis and dry sliding wear performance of Al7075 alloy‐based composites. Five compositions namely Al7075 alloy, Al7075+3 vol % molybdenum disulfide, Al7075+3 vol % molybdenum disulfide+3 vol % zirconium diboride, Al7075+3 vol % molybdenum disulfide+6 vol % zirconium diboride and Al7075+3 vol % molybdenum disulfide+9 vol % zirconium diboride were stir cast and characterized for hardness, x‐ray diffraction, microstructure, and tribological properties. In‐situ formed zirconium diboride particles increase the hardness of Al7075 alloy whereas molybdenum disulfide shows the opposite trend due to its self‐lubricating nature. X‐ray diffraction analysis identifies subsequent phase particles in the matrix while microstructural images exhibit the dispersion and morphology of reinforcement particles. The wear tests and friction coefficient were analyzed with variations of sliding velocity, normal load, sliding distance, and compositions. Further, the obtained wear results were also correlated with microstructure and wear surface topography. Al7075+3 vol % molybdenum disulfide composite shows the lowest coefficient of friction because of its self‐lubricating nature. Al7075+3 vol % molybdenum disulfide+9 vol % zirconium diboride hybrid composite exhibits the lowest wear rate at high velocity as well as at high load and can be potentially used in manufacturing and tribological applications. Moreover, the use of this material may lead to the minimum requirement of external toxic lubricants that make it cost‐effective and environmentally sustainable.

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Section: Effect Of Normal Loadmentioning

confidence: 66%

Synthesis and wear characterization of Al7075/molybdenum disulfide/zirconium diboride hybrid composites

Dubey,

Kumar,

Mohan

2024

Materialwissenschaft Werkst

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“…In particular, the ideal hardness of reinforced composites featuring a mixture surpasses the hardness of unreinforced alloys. This rise in hardness can be attributed to the increased occurrence of hard SiO2 particles in the aluminum matrix, combined with the inherently high hardness of nano graphene particles [40]. The introduction of reinforcement particles to the aluminum matrix serves to enhance their surface area, concurrently reducing the size of aluminum matrix grains.…”

Section: Hardness Measurementsmentioning

confidence: 99%

Influence of SiO2 and nano graphene particles on the microstructure and mechanical behavior of A356 alloy metal composites

Dayanand,

Yadav,

Nagaral

et al. 2024

Res. Eng. Struct. Mat.

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The current research focuses on investigating the microstructural and mechanical properties of aluminum (Al) metal matrix composites (MMCs) reinforced with both silicon dioxide (SiO2) and nano-graphene particles. The composite material was produced using a novel two stage stir cast metallurgy approach. In this study, a constant reinforcement of 1 wt. % nanographene was maintained, while the SiO2 content was independently varied at levels of 2.5, 5, and 7.5 wt. %. Employing scanning electron microscopy (SEM) tool, microstructural analyses were conducted, revealing a uniform dispersion of ceramic silicon dioxide (SiO2) and graphene particles within the as-cast A356 MMCs. Mechanical testing, following the ASTM standards, was carried out on the composites, specifically assessing tensile strength, yield strength, and percentage elongation to evaluate the properties of the Al-based MMCs. The findings of this study indicate a significant enhancement in both tensile and yield strength values for the fabricated composites by 60.64% and 82.78% respectively. However, it is important to note that the percentage elongation decreases as the reinforcement content in the composite increases.

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“…Al7010 alloy and 20-25 micron sized B 4 C composites wear behavior at varying speeds of 0.60 m/s to 2.40 m/s at constant load of 40 N for 3000 m sliding distance is shown in Figure 13. A delamination in the Al7010 alloy has caused fragments of pins to be transferred to the disc, while larger pieces have been ejected [25,26]. Wear is decreased when B 4 C is combined with Al7010.…”

Section: Effect Of Sliding Velocity On Volumetric Wear Lossmentioning

confidence: 99%

Microstructure, physical, tensile and wear behaviour of B₄C particles reinforced Al7010 alloy composites

Mydur

Nagaral

et al. 2023

Manufacturing Rev.

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In the present study looked into how incorporating B4C particles with a size range of 20–25 microns would affect the mechanical, wear and physical properties of composites made from Al7010 alloy. The stir cast method accounted for of the total production of B4C composites. Different mechanical properties, such as hardness, tensile behaviour, wear and density, were measured and analysed for these synthetic composites. Microstructure was characterised by scanning electron microscopy and X-ray diffraction analysis to determine the distribution and phases of particles smaller than a micron. Wear tests were conducted on all the samples at varying loads and speeds. Hardness and tensile strength of Al7010 alloy were improved by adding B4C particles sized 20–25 microns, with only a minor decrease in elongation. Further, as B4C particles accumulated, the density of the Al7010 alloy decreased. SEM examination revealed a wide range of fracture behaviours upon tensile stress. Load and sliding speeds affected the wear behaviour of Al7010 alloy and its composites.

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Mechanical Fractography and Worn Surface Analysis of Nanographite and ZrO2-Reinforced Al7075 Alloy Aerospace Metal Composites

Cited by 20 publications

References 17 publications

Synthesis and wear characterization of Al7075/molybdenum disulfide/zirconium diboride hybrid composites

Synthesis and wear characterization of Al7075/molybdenum disulfide/zirconium diboride hybrid composites

Influence of SiO2 and nano graphene particles on the microstructure and mechanical behavior of A356 alloy metal composites

Microstructure, physical, tensile and wear behaviour of B₄C particles reinforced Al7010 alloy composites

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Mechanical Fractography and Worn Surface Analysis of Nanographite and ZrO2-Reinforced Al7075 Alloy Aerospace Metal Composites

Cited by 20 publications

References 17 publications

Synthesis and wear characterization of Al7075/molybdenum disulfide/zirconium diboride hybrid composites

Synthesis and wear characterization of Al7075/molybdenum disulfide/zirconium diboride hybrid composites

Influence of SiO2 and nano graphene particles on the microstructure and mechanical behavior of A356 alloy metal composites

Microstructure, physical, tensile and wear behaviour of B4C particles reinforced Al7010 alloy composites

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Microstructure, physical, tensile and wear behaviour of B₄C particles reinforced Al7010 alloy composites