Strong Magnetic Field Effect on Surface Tension Associated with an Interfacial Magnetic Pressure

Abstract

The surface tension/interfacial energy is found to be influenced by a strong magnetic field. This phenomenon is associated with an increase in the anomalous morphology of the eutectic during solidification of a hypereutectic Al–Cu alloy in strong magnetic fields. On the basis of further in situ differential thermal analyses, this increase is related to additional undercooling provoked by the magnetic field. A semiquantitative model is developed to reveal the underlying mechanisms. It is proposed that the heterogeneous nucleation is hindered through an increase in contact angle between the liquid and the crucible as a result of an additional surface tension, which is induced by the interfacial magnetic pressure. By revealing this effect, the present model can also clarify the contradictory phenomenon for liquid bismuth in literature.

Magnetic-field dependence of nucleation undercoolings in non-magnetic metallic melts

“…Sun et al proposed that the additional surface tension of liquid metals was induced by the magnetic field using the model of magnetic dipoles [13]. According to the model, the additional interfacial tension γ m induced by the interaction between magnetic dipoles is written as…”

Electromagnetic Field Assisted Metallic Materials Processing: A Review

“…Magnetic alignment of Al 2 Cu phase and competition between the easy magnetization axis and the preferred growth orientation was clearly observed . In recent years, strong magnetic field effects had been well investigated and a range of other effects had already been realized, including magnetic segregation of weakly magnetic materials, magnetic levitation, magnetic induced interfacial energy, magnetic induced/damped diffusion etc., which can be found in recent reviews …”

“…[43] In recent years, strong magnetic field effects had been well investigated and a range of other effects had already been realized, including magnetic segregation of weakly magnetic materials, magnetic levitation, magnetic induced interfacial energy, magnetic induced/damped diffusion etc., which can be found in recent reviews. [5,8,44,45]…”

Effect of Electromagnetic Forces on Separation of Two Immiscible Liquids in the Fe–Cu–C System

“…The contact angle between the liquid metal and crucible wall was reported to have increased due to magneticfield-induced surface tension. 11) In FeCuC system, magnetic-field-induced surface tension seems to cause migration to one area when the magnetic field is high. Figure 8 shows the effect of the strength of the magnetic field on (a) the area ratio and (b) Cu or Fe content in the samples shown in Fig.…”