Understanding the role of ultrasonic cavitation assisted casting of boron nitride nanotube-reinforced aluminum matrix composite

Mohammed, S.M.A.K.; Paul, Tanaji; John, Denny; Zhang, Cheng; Agarwal, Arvind

doi:10.1016/j.jmrt.2023.06.111

Cited by 10 publications

(5 citation statements)

References 47 publications

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“…This is due to the fact that when laser welding is performed without ultrasonic vibration, the high-power laser causes the metal vapor to be enriched in the plate, and it is difficult for the liquid metal to flow downwards due to the pressure of the metal vapor, which results in the formation of a weld that is wide at the top and narrow at the bottom. However, the addition of ultrasonic vibration enhances the downward movement of the liquid metal by promoting forced convection within the liquid metal [20,21].…”

Section: Microstructurementioning

confidence: 99%

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Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Wang,

Dong,

Chai

et al. 2024

Metals

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Aiming at the problem of deterioration of the properties of beta titanium alloy welded joints due to many porosity defects and coarse grains, multi-vibrator ultrasonic-assisted laser welding (M—ULW) technology was used to improve the structure and properties of beta titanium alloy welded joints. The microstructure evolution, tensile strength, elongation, and fracture behavior of the weld joint were studied through scanning electron microscopy, electron back-scatter diffraction, and a universal testing machine. The results show that ultrasonic vibration has no effect on the phase composition of titanium alloy welds during ultrasonic-assisted laser welding. However, it caused all grains in the weld to be transformed into equiaxed grains, and the higher the amplitude, the finer and more uniformly distributed were the equiaxed grains. When the ultrasonic amplitude reached 20 μm, the fine equiaxed crystals were uniformly distributed throughout the weld, and the average grain size of the weld was 56.15 um, which is only one-third of that of the unultrasonicated laser welded joint. Ultrasonic refinement makes the joint grain size decrease, weakens the beta titanium alloy {200} direction weaving, increases the dislocation density within the weld; and increases the tensile strength of the welded joint. The tensile strength of the welded joints exceeded that of the base material by 907 MPa, and the elongation was significantly increased by a factor of 1.8 compared with that of the un-ultrasonicated laser welded joints, resulting in a shift of the fracture location from the center of the weld to the heat-affected zone.

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Section: Microstructurementioning

confidence: 99%

“…14, x FOR PEER REVIEW 6 of 13downward movement of the liquid metal by promoting forced convection within the liquid metal[20,21].…”

mentioning

confidence: 99%

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Wang,

Dong,

Chai

et al. 2024

Metals

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“…Compared with the matrix, the yield strength (YS), ultimate tensile strength (UTS), and elongation (EI) of the AZ91D composites with 1.5% CNTs increased by 21%, 22%, and 42%, respectively. Mohammed et al [15] prepared boron-nitride-nanotube-reinforced aluminum matrix composites by ultrasonic cavitationassisted casting. The results showed that after ultrasonic treatment, the boron nitride nanotubes had good dispersibility in liquid aluminum and an enhanced grain refinement effect.…”

Section: Introductionmentioning

confidence: 99%

“…The wear rate and friction coefficient of the composites were significantly reduced compared to the aluminum matrix. Studies by many scholars have shown that high-energy ultrasonic treatment can effectively add CNTs or other reinforcing materials to the metal matrix, thereby improving the mechanical properties of the matrix [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, most scholars have focused on the exploration of different coating interfaces and seldom investigated the dispersion mechanism of coated CNTs in the melt. In addition, many scholars know that high-energy ultrasonic treatment can effectively improve the dispersion of the reinforced phase in the melt [15,19], but few studies have been conducted on the mechanism of ultrasound action in the melt. Therefore, it is very necessary to explore the mechanism of ultrasonic action during the casting process.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Cu-CoatedCarbon-Nanotubes-Reinforced Aluminum Matrix Composites Fabricated by Ultrasonic-Assisted Casting

Dong,

Zeng,

Yan

2024

Metals

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Carbon nanotubes (CNTs) are considered ideal nanoscale reinforcement for the development of high-performance metal matrix composites due to their unique structure and excellent mechanical properties. However, CNTs are easy to agglomerate and have poor wettability with the aluminum matrix, resulting in unsatisfactory effects when added to the aluminum melt. In this study, Cu-coated carbon nanotubes (Cu@CNTs)-reinforced aluminum matrix composites were fabricated by high-energy ultrasonic-assisted casting. Moreover, the effects of different Cu@CNTs content on the microstructure and mechanical properties of aluminum matrix composites were explored. Meanwhile, Fluent 19.0 software was used to further explore the function of ultrasonic vibration in the melt. The results demonstrated that the mechanical properties of composite with 1.2 wt% Cu@CNTs are optimal. Compared with the matrix, the composite with 1.2 wt% Cu@CNTs displayed a 39.3% increase in yield strength, 53.5% increase in ultimate tensile strength, and 5.7% increase in elongation. The simulation results showed that the uniform dispersion of Cu@CNTs and grain refinement can be attributed to the acoustic streaming effect and cavitation effect of high-energy ultrasound. The improvement of the properties of the composites can be attributed to the grain refinement and the load-bearing effect of CNTs.

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Exploring the Potential of Wire Fed Direct Energy Deposition of Aluminum–Boron Nitride Nanotube Composite: Microstructural Evolution and Mechanical Properties

Mohammed,

Aleman,

John

et al. 2023

Adv Eng Mater

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Recent advancements have shown great promise in utilizing wire‐fed direct energy deposition (DED) for building aluminum alloy structures. However, utilizing the wire‐fed DED approach for fabricating metal matrix composite structures remains a significant challenge. This study used a wire‐based AM process to successfully produce a one‐dimensional boron nitride nanotube (BNNT)‐reinforced aluminum composite with high strength. An Al‐BNNT electrode was developed in‐house. The microstructural changes that occurred during layer‐by‐layer deposition were investigated. The grain morphology changed from equiaxed grains in the bottom layer to columnar grains in the top layer. BNNTs act as nuclei to promote the formation of equiaxed grains and interfacial compounds (AlN and AlB2) during solidification. This resulted in improved strength, with Al‐BNNT composite exhibiting a tensile strength of 47 MPa, 2.3 times higher than its pure Al. Higher strength was attributed to the retention and uniform distribution of BNNT reinforcement in the melt pool, leading to effective load transfer. This study demonstrates the potential of additive manufacturing for producing high‐performance metal matrix composites with novel 1D reinforcements and improved multifunctional properties.This article is protected by copyright. All rights reserved.

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Understanding the role of ultrasonic cavitation assisted casting of boron nitride nanotube-reinforced aluminum matrix composite

Cited by 10 publications

References 47 publications

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Microstructure and Mechanical Properties Ultrasonic Assistance Laser Welded Joints of Beta Titanium Alloy with Multiple Vibrators

Microstructure and Mechanical Properties of Cu-CoatedCarbon-Nanotubes-Reinforced Aluminum Matrix Composites Fabricated by Ultrasonic-Assisted Casting

Exploring the Potential of Wire Fed Direct Energy Deposition of Aluminum–Boron Nitride Nanotube Composite: Microstructural Evolution and Mechanical Properties

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