Measurement of Diffusion Coefficient in Liquid Metal under Static Magnetic Field

Miyake, Takao; Inatomi, Yuko; Kuribayashi, Kazuhiko

doi:10.1143/jjap.41.l811

Cited by 32 publications

(19 citation statements)

References 2 publications

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“…The degree of vacuum in the chamber was held at less than 10 −2 Pa after 1 h without additional evacuation. A homogeneous and static magnetic field with a maximum magnetic flux density of 6 T was produced by a liquid helium-free superconducting magnet with a bore of 300 mm diameter and 600 mm length (Toshiba, TM-6VH30) [17]. A cube of solid material was preheated on the specimen holder by a 100 W continuous wave CO 2 laser with a wavelength of 10.6 μm (Synrad, Model 57-2) to increase the electrical conductivity of the specimen for levitation.…”

Section: Introductionmentioning

confidence: 99%

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

et al. 2007

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The density and thermal conductivity of a high-purity silicon melt were measured over a wide temperature range including the undercooled regime by non-contact techniques accompanied with electromagnetic levitation (EML) under a homogeneous and static magnetic field. The maximum undercooling of 320 K for silicon was controlled by the residual impurity in the specimen, not by the melt motion or by contamination of the material. The temperature dependence of the measured density showed a linear relation for temperature as:where T m is the melting point of silicon. A periodic heating method with a CO 2 laser was adopted for the thermal conductivity measurement of the silicon melt. The measured thermal conductivity of the melt agreed roughly with values estimated by a Wiedemann-Franz law.

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Section: Introductionmentioning

confidence: 99%

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

et al. 2007

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“…The activation energy for diffusion was determined by the most slowly moving component. There are a number of reports showing that a magnetic field could effectively suppress the atom diffusion in the conducting liquids [19,20] and alloys [21]. On the one hand, a magnetic field suppresses the convection of the melt and the mass transfer is mainly dominated by atom diffusion rather than convection.…”

Section: Discussionmentioning

confidence: 99%

Nucleation and Growth Behaviors of Primary Phase in Al-Cu Hypereutectic Alloy in High Magnetic Fields

Li¹,

Ren²,

Ren³

et al. 2010

PIER Letters

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Abstract-The nucleation and growth of primary Al 2 Cu phase in the Al-34.3wt%Cu hypereutectic alloy without and with magnetic fields have been investigated by differential thermal analysis (DTA). The DTA curves indicated that the nucleation temperature of primary phase was significantly reduced in a magnetic field. The X-ray diffraction (XRD) patterns confirmed that the c-axes of primary Al 2 Cu crystals oriented along the direction parallel to a magnetic field. The microstructures showed that primary crystals aligned along a magnetic field and that their number distinctly increased with increasing a magnetic field as well. The suppression of nucleation in a magnetic field could be caused by the increase of the interfacial energy between the liquid and nucleus and the reduction of atom diffusion rates while the orientation of primary crystals were mainly attributed to both of the magnetic torque and the thermoelectric magnetohydrodynamic (TEMHD) flows.

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“…When a high magnetic field is applied, the mass transfer in the melt changes from convection-controlled to diffusion-controlled due to the braking effect of the high magnetic field on the convection [24] . The diffusivity coefficient of charged particle under magnetic field can be identified as [25] D ⊥ ≈D/(1+ω 2 τ 2 ),…”

Section: Discussionmentioning

confidence: 99%

Alignment of primary Al3Ni phases in hypereutectic Al-Ni alloys with various compositions under high magnetic fields

Wang

Liu

et al. 2008

Sci. China Ser. E-Technol. Sci.

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Al-Ni hypereutectic alloys with various compositions were solidified under various magnetic field conditions to investigate the alignment of primary Al 3 Ni phases. The results showed that the application of high magnetic fields could improve the homogeneity of the primary Al 3 Ni phase distribution and induce the alignment of primary Al 3 Ni phases in the direction perpendicular to the magnetic field direction to form chain-like structures. However, the alignment was different from the orientation of the Al 3 Ni phases. Furthermore, the degree of the alignment decreased with the increasing concentration of Ni element. This can be attributed to the combination effects of high magnetic field and alloy composition on the concentration field around the crystallized primary Al 3 Ni crystals.

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Measurement of Diffusion Coefficient in Liquid Metal under Static Magnetic Field

Cited by 32 publications

References 2 publications

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

Nucleation and Growth Behaviors of Primary Phase in Al-Cu Hypereutectic Alloy in High Magnetic Fields

Alignment of primary Al3Ni phases in hypereutectic Al-Ni alloys with various compositions under high magnetic fields

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