Bulk viscosity and ultrasonic attenuation in liquid metals

Awasthi, O. N.

doi:10.1016/0375-9601(85)90532-8

Cited by 6 publications

(8 citation statements)

References 12 publications

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“…However, it has been found that the predictions given by Eq. (2) for low melting point metals (< 350°C) are much smaller than the experimental measurements (Sahu, 1984;Awasthi & Murthy, 1985). For molten Mg (T m = 650°C), ρ = 1590 kg m -3 , c =1500 m s -1 (Ramirez et al, 2008), η = 1.25 mN s m -2 , λ T = 78 W m -1 K -1 , and c p = 1.36 J g -1 K -1 (Brandes, and Brook, 1992), where for most liquids, c p /c v = 1.0-1.1.…”

Section: Ultrasonic Attenuation In Molten Magnesium Alloysmentioning

confidence: 67%

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Ultrasonic Grain Refinement of Magnesium and Its Alloys

Ramirez¹,

Qian²

2011

Magnesium Alloys - Design, Processing and Properties

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Section: Ultrasonic Attenuation In Molten Magnesium Alloysmentioning

confidence: 67%

“…The Stokes-Kirchhoff relation allows prediction of the attenuation coefficient α of an ultrasonic wave in a liquid by the addition of a viscous component v α and a thermal component T α in the form (Sahu, 1984;Awasthi & Murthy, 1985;Kuttruff, 1991) 2 2 3 24 1 1 3…”

Section: Ultrasonic Attenuation In Molten Magnesium Alloysmentioning

confidence: 99%

Ultrasonic Grain Refinement of Magnesium and Its Alloys

Ramirez¹,

Qian²

2011

Magnesium Alloys - Design, Processing and Properties

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“…͑1͒ for low melting point metals ͑Ͻ350°C͒ are much smaller than the experimental measurements. 18 This work presents an approach to assessing ultrasonic attenuation in molten magnesium alloys. The key idea is to relate the ultrasonic amplitude ͑A͒ to the solidified structure of the ultrasonicated molten alloys in terms of the grain density ͑G ͒.…”

Section: ͑1͒mentioning

confidence: 99%

“…16 The approach has been typically used to determine the attenuation coefficients in liquid metals that have a very low melting point such as mercury, lead, tin, sodium, etc. 17,18 because of the direct contact between the crystal and the liquid metal. Recently, Sivkov et al 19 reported the use of a similar pulsed-phase method to characterize the ultrasonic attenuation in a liquid Pd-18 at.…”

Section: Introductionmentioning

confidence: 99%

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An approach to assessing ultrasonic attenuation in molten magnesium alloys

Qian

Ramirez

2009

Journal of Applied Physics

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Few experimental data are available on ultrasonic attenuation in molten light alloys due to lack of means of characterization. An approach has been proposed and demonstrated to assessing ultrasonic attenuation in molten magnesium alloys based on the finding that the grain density in ultrasonicated magnesium alloy samples depends linearly on ultrasonic amplitude along the propagation direction. Hence, the attenuation of the ultrasonic amplitude with propagation distance can be effectively assessed according to the variations in the grain density with propagation distance. Metallographic analyses revealed that the dependence of grain density on propagation distance is best described exponentially with respect to different amplitudes. Consequently, the attenuation behavior of the ultrasonic amplitude with propagation distance can be described by the same exponential law. The characteristic ultrasonic attenuation coefficients in three benchmark molten magnesium alloys investigated were determined accordingly. The validation experiments confirmed the validity of the data produced. Ultrasonic attenuation shows dependence on alloy chemistry.

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Mechanical Wave Propagation in Solidifying Metals: Physico‐Mathematical Model and Numerical Tests

Chen

Wang

2023

Advcd Theory and Sims

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Despite the widespread application of mechanical waves in solidifying metals, the wave propagation laws in melt and the motion patterns of melts are unclear, which has seriously hindered the development of vibration solidification treatment. It is difficult to solve the wave propagation because of the spatial heterogeneity and the intrinsic viscoelasticity of solidifying metals. In this paper, a physico-mathematical model is developed by coupling the unsteady temperature field and the integral Hooke-Kelvin model unifying various rheological models during solidification, and simplifies to wave equations by introducing memory factors. Then, the wave equations are solved by a staggered-grid high-order difference method. Subsequently, the propagation laws of mechanical waves in a large casting and a feeding channel during solidification are analyzed, eventually verified by casting experiments. It is shown that the viscoelasticity of solidifying metals is significant for the wave field. In the large casting, both displacements and stresses exhibit complex multi-lobe patterns. In the feeding channel, the formation of micropores between the quasi-liquid and the quasi-solid phase and the feeding improvement by vibrations are well explained by simulation. The numerical model is a novel reliable method to theorize the solidification under vibration and expands the potential applications of vibration.

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Bulk viscosity and ultrasonic attenuation in liquid metals

Cited by 6 publications

References 12 publications

Ultrasonic Grain Refinement of Magnesium and Its Alloys

Ultrasonic Grain Refinement of Magnesium and Its Alloys

An approach to assessing ultrasonic attenuation in molten magnesium alloys

Mechanical Wave Propagation in Solidifying Metals: Physico‐Mathematical Model and Numerical Tests

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