Using magnetic field gradients to control the directional solidification of alloys and the growth of single crystals

Ganapathysubramanian, Baskar; Zabaras, Nicholas

doi:10.1016/j.jcrysgro.2004.06.020

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…This is because convective flow in the melt leads to fluctuations in the solute concentration in the produced ingot (macrosegregation) [2]. So, one would aim to be able to grow a single crystal with a planar interface and a quiescent melt near the solid-liquid interface where solute transport is merely through diffusion [3] [4]. Elimination of melt convection maintains a stable planar solid-liquid interface thereby minimizing the solid ingot defect densities and compositional variations [5].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Braking of Natural Convection during Ohno Continuous Casting of an Industrial Aluminum Alloy

Fashu¹

2015

IJNM

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With the purpose of obtaining compositionally uniform ingots during Ohno continuous casting of a dilute industrial aluminum alloy through eliminating segregation due to convection, a magnetic field strength required to damp natural convection and suppress macrosegregation was numerically determined. This was achieved by solving conservation equations of continuity, momentum, energy and Maxwell's equations in order to predict the magnetic field effects on flow field (determining macrosegregation). The electromagnetic field was applied orthogonally to the natural convection flow. Through this approach, the optimum magnetic field strength required to damp natural convection and establish diffusion controlled solute transport of the alloy during solidification was established.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Braking of Natural Convection during Ohno Continuous Casting of an Industrial Aluminum Alloy

Fashu¹

2015

IJNM

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“…Most of these techniques utilise the conducting nature of the melt to affect the crystal growth using a magnetic field. [4][5][6][7][8][9] Morita performed the evaluation of thermodynamic properties of impurities in molten silicon such as the activity coefficient and the interaction parameters of harmful impurities. 10 Khattak developed a process to remove B by refining metallurgical grade (MG) silicon in the molten state followed by DS process.…”

Section: Introductionmentioning

confidence: 99%

“…Most of these techniques utilise the conducting nature of the melt to affect the crystal growth using a magnetic field. 4–9…”

Section: Introductionmentioning

confidence: 99%

Purifying multicrystalline silicon by directional solidification method with induced electromagnetic field

Zhang

et al. 2011

Materials Science and Technology

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As an improved directional solidification (DS) method, the complex directional solidification (CDS) method is used for purifying and preparing multicrystalline silicon ingot in this experiment. The induced electromagnetic field is imposed to control refining and solidification process. An integral silicon ingot with the diameter of 130 mm, the length of 130 mm and the weight of 4 kg is successfully fabricated in a self-designed CDS furnace. Metallographic analyses reveal that the direction of the most grains is parallel to the axial of silicon ingot. Analyses proved that the distribution of impurities in the cross-section is more homogeneously, the distribution in axial is improved and the effective length of silicon ingot is increased. Theoretical calculations indicate that the effect of solidified rate on the removal of impurities is limited and the impurities can be removed effectively after more than two times directional solidification process.

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“…Recently, Evans et al [11] demonstrated that a magnetic gradient could be used to damp convection in any material, conducting or non-conducting. Ganapathysubramanian and Zabaras [12] have investigated the effect of magnetic gradients on the quality of the crystal. In the present work, the effect on growth of the variation of the Kelvin force induced by the applied magnetic gradient is investigated.…”

Section: Introductionmentioning

confidence: 99%

Control of solidification of non-conducting materials using tailored magnetic fields

Ganapathysubramanian

Zabaras

2005

Journal of Crystal Growth

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Using magnetic field gradients to control the directional solidification of alloys and the growth of single crystals

Cited by 11 publications

References 18 publications

Electromagnetic Braking of Natural Convection during Ohno Continuous Casting of an Industrial Aluminum Alloy

Electromagnetic Braking of Natural Convection during Ohno Continuous Casting of an Industrial Aluminum Alloy

Purifying multicrystalline silicon by directional solidification method with induced electromagnetic field

Control of solidification of non-conducting materials using tailored magnetic fields

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