Ultrasonic Treatment of Light Alloy Melts

Éskin, G. I.

doi:10.1201/9781498701792

Cited by 342 publications

(536 citation statements)

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“…[1], which was far greater than the cavitation threshold of 80 W cm À2 . [19] The effect of cavitation produced by ultrasonic vibration in the Al melt was, therefore, obvious in our work. Cavitation bubbles nucleate in the Al melt on partly wetted carbon interfaces and gas pockets in the melt.…”

Section: Resultsmentioning

confidence: 85%

“…Moreover, the fully developed cavitation occurs in the molten aluminum alloys when I ‡ 80 W cm À2 . [19] In our experiment, it was reasonable to assume c % 1.3 9 10 3 ms À1 [19] for molten aluminum alloys, where q = 2.385 g cm À3 . The amplitude of the ultrasound A was 35 lm and the frequency f was 17.5 kHz.…”

Section: Resultsmentioning

confidence: 99%

“…It is well-known that one of the main factors affecting the efficiency of ultrasonic treatment is the ultrasonic intensity or the extent of acoustic cavitation, where the ultrasonic intensity I is defined by [19] I…”

Section: Resultsmentioning

confidence: 99%

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Development of Al-B-C Master Alloy Under External Fields

Joshi

VadakkeMadam

Eskin

et al. 2015

Metall Mater Trans A

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This study investigates the application of external fields in the development of an Al-B-C alloy, with the aim of synthesizing in situ Al 3 BC particles. A combination of ultrasonic cavitation and distributive mixing was applied for uniform dispersion of insoluble graphite particles in the Al melt, improving their wettability and its subsequent incorporation into the Al matrix. Lower operating temperatures facilitated the reduction in the amount of large clusters of reaction phases, with Al 3 BC being identified as the main phase in XRD analysis. The distribution of Al 3 BC particles was quantitatively evaluated. Grain refinement experiments reveal that Al-B-C alloy can act as a master alloy for Al-4Cu and AZ91D alloys, with average grain size reduction around 50 pct each at 1 wt pctAl-1.5B-2C additions.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Development of Al-B-C Master Alloy Under External Fields

Joshi

VadakkeMadam

Eskin

et al. 2015

Metall Mater Trans A

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“…[1][2][3] Although ultrasound-induced grain refinement has been shown effective in many metallic alloy systems, almost all previous research have interpreted the mechanism of grain refinement based on post-mortem microstructural characterization of the solidified alloys and empirical correlation, if any, between the measured grain size and the input ultrasonic power. [4,5] A very recent high-speed imaging study of ultrasonic treatment of a solidifying organic transparent alloy revealed that the shock wave emitted from imploding bubbles can fracture the growing dendrites, [6] increasing the grain multiplication effect that leads to the enhancement of grain refinement. However, in situ and real time studies of the fundamentals of how the highly dynamic ultrasonic waves and the ultrasonic bubbles interact with the liquid metal, the semisolid and solid phases nucleated during solidification have not been reported mainly due to the difficulties in studying the bubble dynamics in the opaque liquid metal.…”

Section: Applying Ultrasonic Waves Inside Liquid Mediamentioning

confidence: 99%

In Situ Synchrotron X-ray Study of Ultrasound Cavitation and Its Effect on Solidification Microstructures

Tan

Lee

2014

Metall Mater Trans B

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Considerable progress has been made in studying the mechanism and effectiveness of using ultrasound waves to manipulate the solidification microstructures of metallic alloys. However, uncertainties remain in both the underlying physics of how microstructures evolve under ultrasonic waves, and the best technological approach to control the final microstructures and properties. We used the ultrafast synchrotron X-ray phase contrast imaging facility housed at the Advanced Photon Source, Argonne National Laboratory, US to study in situ the highly transient and dynamic interactions between the liquid metal and ultrasonic waves/bubbles. The dynamics of ultrasonic bubbles in liquid metal and their interactions with the solidifying phases in a transparent alloy were captured in situ. The experiments were complemented by the simulations of the acoustic pressure field, the pulsing of the bubbles, and the associated forces acting onto the solidifying dendrites. The study provides more quantitative understanding on how ultrasonic waves/bubbles influence the growth of dendritic grains and promote the grain multiplication effect for grain refinement. have been widely used in industry, e.g., in ultrasonic cleaning, sonochemistry, and medical treatment. In the past few decades, extensive laboratory results have demonstrated that applying ultrasound waves into solidifying liquid alloys can lead to the refinement of alloy microstructures. [1][2][3] Although ultrasound-induced grain refinement has been shown effective in many metallic alloy systems, almost all previous research have interpreted the mechanism of grain refinement based on post-mortem microstructural characterization of the solidified alloys and empirical correlation, if any, between the measured grain size and the input ultrasonic power. [4,5] A very recent high-speed imaging study of ultrasonic treatment of a solidifying organic transparent alloy revealed that the shock wave emitted from imploding bubbles can fracture the growing dendrites, [6] increasing the grain multiplication effect that leads to the enhancement of grain refinement. However, in situ and real time studies of the fundamentals of how the highly dynamic ultrasonic waves and the ultrasonic bubbles interact with the liquid metal, the semisolid and solid phases nucleated during solidification have not been reported mainly due to the difficulties in studying the bubble dynamics in the opaque liquid metal. In this paper, we report a number of in situ imaging studies of the dynamic behavior of ultrasonic bubbles in a Sn-13 wt pct Bi and a Bi-8 wt pct Zn alloy using the ultrafast X-ray phase contrast imaging (PCI) facility housed at the Advanced Photon Source (APS), Argonne National Laboratory, US. The real-time imaging studies are complemented by a numerical simulation of the bubble dynamics using the classical Gilmore model. [7] The experiments were carried out at the beamline 32-ID-B of APS, and the detailed description of the experiment can be found in References 8, 9. The undulator gap was set to 14 ...

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“…Ultrasonic treatment is one of the most efficient ways of melt treatment leading to alloy grain size reduction and homogeneous distribution of reinforcing particles in its structure [4,5]. Besides, ultrasonic treatment intensifies degassing process, provides additional mixing, prevents coring and concentration of non-metal inclusions on grain boundaries, which has a positive impact of the formation of uniform metal structure in the process of solidification [6].…”

Section: Introductionmentioning

confidence: 99%

Physico‐Mechanical and Electrical Properties of Aluminum‐Based Composite Materials with Carbon Nanoparticles

Vorozhtsov¹,

Eskin²,

Vorozhtsov³

et al. 2014

Light Metals 2014

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Nanocomposite materials with the matrix of an A356 alloy reinforced with 0.2 and 1 wt% of high-elastic nanodiamonds were produced by ultrasonic dispersion of nanoparticles in the melt followed by casting in a metallic mold. The structure as well as the physical and mechanical properties of the cast samples were examined using optical and scanning electron microscopy, hardness and tensile testing. It is shown that the hardness, Young's modulus and electrical resistivity increase with introduction of nanodiamond particles.

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Ultrasonic Treatment of Light Alloy Melts

Cited by 342 publications

References 0 publications

Development of Al-B-C Master Alloy Under External Fields

Development of Al-B-C Master Alloy Under External Fields

In Situ Synchrotron X-ray Study of Ultrasound Cavitation and Its Effect on Solidification Microstructures

Physico‐Mechanical and Electrical Properties of Aluminum‐Based Composite Materials with Carbon Nanoparticles

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