Refining mechanism of the electric current pulse on the solidification structure of pure aluminum

Liao, Xiliang; Zhai, Qijie; Luo, Jun; Chen, Wenjie; Gong, Yu

doi:10.1016/j.actamat.2007.01.014

Cited by 215 publications

(112 citation statements)

References 11 publications

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“…They are based on the electron-phonon interaction, 15,16 electron-dislocation interaction, 17,18 collective motion approximation, 19,20 thermodynamic consideration, 21,22 respectively and so on. Experimental investigation has provided very rich evidences on using electric current to affect microstructure, 23,24 crystallographic taxture, 25,26 workability, 27,28 and processing environments. 29,30 In the present work, thermodynamic consideration is implemented to investigate the inclusion agglomeration behaviour under electric current.…”

Section: Introductionmentioning

confidence: 99%

Inclusion agglomeration in electrified molten metal: Thermodynamic consideration

Zhao

Qin

2017

Materials Science and Technology

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Abstract:The effect of electric current on inclusion agglomeration in molten metal has been investigated. It is found that the agglomeration is dependent on the electric current density, distance between inclusions and orientation of electric field. Electric current retards the agglomeration unless two inclusions are aligned along or closely to the current flow streamlines and the distance between inclusions is less than a critical value. The mechanism is also validated in the computation of cluster agglomeration. The numerical results provide a comprehensive indication for the current-induced inclusion removal and current-induced inclusion elongation. When the inclusions are in long thin shape, the calculation predicts the current-induced microstructure alignment and current-induced microstructure refinement phenomena.

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Section: Introductionmentioning

confidence: 99%

Inclusion agglomeration in electrified molten metal: Thermodynamic consideration

Zhao

Qin

2017

Materials Science and Technology

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“…[6] Given the low efficiency of master alloys, the application of UST has the potential to provide a greater level of additional refinement. [7][8][9][10][11] When ultrasonic waves of sufficient amplitude and frequency move through the melt, the resulting acoustic cavitation is believed to activate sites for heterogeneous nucleation and induce fragmentation and de-agglomeration, while acoustic streaming provides convection currents that distribute the nucleants and newly formed grains throughout the melt. [11] These mechanisms acting together should further significantly reduce the grain size.…”

Section: Introductionmentioning

confidence: 99%

Identifying the Stages during Ultrasonic Processing that Reduce the Grain Size of Aluminum with Added Al3Ti1B Master Alloy

2017

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“…Here, pulsed electric current, [10][11][12][13][14] as an instantaneous high energy input method with high efficiency and low energy consumption, is applied to the molten steel containing the MnS inclusions 15 to manipulate the transport of electrically neutral non-metallic inclusions in a conductive liquid. The steel containing inclusions is selected for study due to the particles' 3 position driven by electric current can be recorded in the cooled cast steel.…”

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confidence: 99%

Electric current-driven migration of electrically neutral particles in liquids

Zhang

Qin

2014

Applied Physics Letters

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We design and experimentally demonstrate a migration of electrically neutral particles in liquids driven by electric current according to the discrepancies of their electrical conductivities. A force from electric current to electrically neutral particles has been identified to drive the particles toward the lateral surface from the centre of suspension via three distinguishable zones, namely pushing, trapping and expelling zones. The driving force can overtake gravity in practical cases. The property of the force is found neither similar to that of the force in electromagnetophoresis nor similar to that of the electromigration force in terms of direction and magnitude. An expression for the force at the pushing zone has been developed based on the numerical calculation of the thermodynamics of suspension fluids.The excellent agreement between numerical calculations and experimental data demonstrates that our calculation provides fundamental and predictive insight into particles separation from the liquids. Therefore, it is possible to use the force in many engineering applications such as separation of particles according to the differences of their electrical conductivities. *Corresponding authors.

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Refining mechanism of the electric current pulse on the solidification structure of pure aluminum

Cited by 215 publications

References 11 publications

Inclusion agglomeration in electrified molten metal: Thermodynamic consideration

Inclusion agglomeration in electrified molten metal: Thermodynamic consideration

Identifying the Stages during Ultrasonic Processing that Reduce the Grain Size of Aluminum with Added Al3Ti1B Master Alloy

Electric current-driven migration of electrically neutral particles in liquids

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