Microstructural evolution in ultrafine grained Al-Graphite composite synthesized via combined use of ultrasonic treatment and friction stir processing

Rajeshkumar, R.; Udhayabanu, V.; Srinivasan, A.; Ravi, K.R.

doi:10.1016/j.jallcom.2017.07.280

Cited by 25 publications

(5 citation statements)

References 42 publications

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“…In the UAFSP method, the mechanical properties enhanced due to homogenous dispersion of nano particles in the aluminium alloy, increased displacement density and deformation of material. 16,22…”

Section: Resultsmentioning

confidence: 99%

“…In another study, Kumar et al 15 reported that uniform grain size of reinforced particles is obtained when the TRS is increased, which resulted in increased corrosion resistance. Rajesh Kumar et al 16 carried out a microstructural evolution on Al-Graphite composites which was fabricated by UAFSP method. They concluded that the UAFSP reduced the porosity and agglomeration of graphite particles in the composite.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B₄C surface composite

Swathi

Raju

Rao

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Ultrasonic Vibration assisted Friction Stir Processing is one of the advanced surface modification techniques developed for ductile materials like aluminium to improve their surface properties. The present study is aimed to improve mechanical properties of the AA7075-T651 surface composite by reinforcing the nano B4C particles with optimum working condition. Experiments are conducted at different levels of tool rotation speed, tool processing speed and volume percentage of nano B4C particles with and without ultrasonic vibrations and the experimental results for ultimate tensile strength, impact strength, yield strength, percentage of elongation and hardness are measured. Jaya Algorithm (JA) is used and found best optimum condition such as 1112 r/min of tool rotational speed, 43.96 mm/min of tool traverse speed and 4.02 vol % of B4C nano particles. Mechanical properties and microstructure are investigated using optical Microscope, Field emission scanning electron microscope and Transmission electron microscopy analysis. A fine grain structure and uniform distribution of reinforcement are found in the matrix with the ultrasonic vibrations and the mechanical properties of the AA7075 alloy are improved. The microstructure of the surface composite is correlated with the mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B₄C surface composite

Swathi

Raju

Rao

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Higher strain-hardening behavior of the composite in comparison with matrix alloy was well documented in other nanocomposite systems as well. [32][33][34]…”

Section: Compression Strength Propertiesmentioning

confidence: 99%

Microstructural Evolution and Property Evaluation of In Situ Al–MgAl₂O₄ Nanocomposite Prepared by γ‐Al₂O₃ and Ultrasonication‐Assisted Impeller Mixing

Vadakke Madam,

Manani,

Eskin

2024

Adv Eng Mater

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Synthesis of nanocomposites is challenging due to the difficulties in achieving homogeneous distribution of reinforcing particles in metal. In this paper, an in‐situ Al‐MgAl2O4 nanocomposite billet was prepared by the reaction of ɣ‐Al2O3 with molten Al and ultrasonication‐assisted impeller mixing. The microstructure of the composite showed homogeneously distributed MgAl2O4 crystals alongside their clusters in the Al matrix. Microstructural analysis revealed MgAl2O4 crystals distributed from 20 nm to 4 μm in size. The hardness was found to vary within the composite from 50 Hv for the matrix to 140 Hv for particle cluster regions. The grain size was reduced from 1000 μm in reference metal (CP Al) to 100 μm in the composite. The compression strength of the composite was increased substantially and higher strain hardening effect in comparison with Al was noticed in the compression test. The signatures of extensive plastic deformation such as dislocation pileups, deformed grains, grain boundary pinning etc. were observed in the composite via transmission electron microscopy. Damping properties of as‐cast composite were higher than those of CP Al in the temperature range from room temperature to 350 °C. After rolling the composite up to 40% reduction, the damping capacity (Tanδ) of the composite was found to increase marginally after 150 °C. Higher damping was found to reoccur after the annealing treatment of the composite. The improvement in damping capacity at RT was possibly influenced by the micron sized MgAl2O4 and at higher temperatures by the nano‐sized MgAl2O4 crystals. The reoccurrence of higher damping in the annealed composite underlined the stability of finer grains due to the grain boundary pinning by nano‐sized MgAl2O4 crystals. The studies on the damping property of the composite displayed the benefits of having dual size distribution of MgAl2O4 crystals (nm and μm) in the composite.This article is protected by copyright. All rights reserved.

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“…It is difficult to say which one guarantees composites with the properties required for electrical applications, i.e., high electrical conductivity and high tensile strength. This is due to the problems associated with the poor wettability of graphene and copper or graphite and aluminum, the large difference in the density of copper and graphene, and the unstable quality of graphene currently available on the market [34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

New Graphene Composites for Power Engineering

et al. 2022

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Intensive research is underway worldwide to develop new conductive materials for applications in the power industry. Such tests aim to increase the electrical conductivity of materials for conductors and cables, thus increasing the current carrying capacity of the line and reducing the loss of electricity transmission. The scientific discovery of recent years, graphene, one of the allotropic types of carbon with very high electrical and thermal conductivity and mechanical strength, creates great opportunities for designing and producing new materials with above-standard operational properties. This project concentrates on developing technology for manufacturing aluminum-graphene and copper-graphene composites intended to be used to produce a new generation of power engineering conductors. In particular, we present the results of the research on the mechanical synthesis of aluminum-graphene and copper -graphene composites, as well as the results of the electric, mechanical, and structural properties of rods obtained after the extrusion process and wires after the drawing process.

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Microstructural evolution in ultrafine grained Al-Graphite composite synthesized via combined use of ultrasonic treatment and friction stir processing

Cited by 25 publications

References 42 publications

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B₄C surface composite

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B₄C surface composite

Microstructural Evolution and Property Evaluation of In Situ Al–MgAl₂O₄ Nanocomposite Prepared by γ‐Al₂O₃ and Ultrasonication‐Assisted Impeller Mixing

New Graphene Composites for Power Engineering

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Microstructural evolution in ultrafine grained Al-Graphite composite synthesized via combined use of ultrasonic treatment and friction stir processing

Cited by 25 publications

References 42 publications

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B4C surface composite

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B4C surface composite

Microstructural Evolution and Property Evaluation of In Situ Al–MgAl2O4 Nanocomposite Prepared by γ‐Al2O3 and Ultrasonication‐Assisted Impeller Mixing

New Graphene Composites for Power Engineering

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About

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B₄C surface composite

Optimization of ultrasonic vibration assisted friction stir process to improve mechanical properties of AA7075-nano B₄C surface composite

Microstructural Evolution and Property Evaluation of In Situ Al–MgAl₂O₄ Nanocomposite Prepared by γ‐Al₂O₃ and Ultrasonication‐Assisted Impeller Mixing