Influence of thermoelectric effects on the solid–liquid interface shape and cellular morphology in the mushy zone during the directional solidification of Al–Cu alloys under a magnetic field

Li, Xiaojian; Fautrelle, Yves; Ren, Zhuoxiang

doi:10.1016/j.actamat.2007.02.031

Cited by 148 publications

(76 citation statements)

References 7 publications

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“…The damping effect of the static magnetic fields is quite clear. However, both experimental observations [33] and numerical simulation [34] showed that magnetohydrodynamics in an undercooled melt becomes complex once dendritic growth sets in. Another type of forced convection, termed thermoelectric magnetohydrodynamics (TEMHD), develops in the vicinity of a growing dendrite.…”

Section: Dendritic Growth Velocities Of Pure Nickel Under Forced Convmentioning

confidence: 99%

Dendritic growth velocities in an undercooled melt of pure nickel under static magnetic fields: A test of theory with convection

et al. 2016

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Dendritic growth velocities in an undercooled melt of pure nickel under static magnetic fields up to 6 T were measured using a high-speed camera. The growth velocities for undercoolings below 120 K are depressed under low magnetic fields, but are recovered progressively under high magnetic fields. This retrograde behavior arises from two competing kinds of magnetohydrodynamics in the melt and becomes indistinguishable for higher undercoolings. The measured data is used for testing of a recent theory of dendritic growth with convection. A reasonable agreement is attained by assuming magnetic field-dependent flow velocities. As is shown, the theory can 2 also account for previous data of dendritic growth kinetics in pure succinonitrile under normal gravity and microgravity conditions. These tests demonstrate the efficiency of the theory which provides a realistic description of dendritic growth kinetics of pure substances with convection.

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Section: Dendritic Growth Velocities Of Pure Nickel Under Forced Convmentioning

confidence: 99%

Dendritic growth velocities in an undercooled melt of pure nickel under static magnetic fields: A test of theory with convection

et al. 2016

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“…Gorbunov [29] first investigated the effect of TEMHD on single crystal growth. Li et al [30] observed that TEMHD flows had a marked effect on interface shape and cellular morphology during directional solidification and evaluated the magnitude of the flows at different scales. In the growth of primary Al 2 Cu crystals, the temperature gradient appears near the solid-liquid interfaces due to latent heat release.…”

Section: Discussionmentioning

confidence: 99%

“…Following Li et al's evaluation [30], The TEMHD flows dominate the convection of the melt when the magnetic field is less than the critical magnetic field B max . It can be expressed as following…”

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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“…2(b)), indicating that the convection has been inverted due to the TEMC. 32) Recently, Li et al 33,34) investigated the influence of a high magnetic field on the morphological instability of the growth interface of binary alloys during directional solidification. The obtained results indicated that the high magnetic field could induce the change in the morphological instability of the growth interface in terms of the TEMC.…”

Section: Thermoelectromagnetic Effectmentioning

confidence: 99%

Solidified Structure Control of Metallic Materials by Static High Magnetic Fields

et al. 2010

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Recently, the studies on the effects of high magnetic fields on solidification processes have been paid much attention both from the fundamental and applied points of view. With the aid of the enhanced Lorentz force and magnetization effect caused by the remarkably increased magnetic field intensity, several interesting phenomena, such as the control of fluid flow and particle migration in a melt, crystal orientation, and phase alignment, have been obtained. Moreover, the magnetic force induced by the interaction of magnetization and high magnetic field gradient has been evidenced to show significant effects on the microstructure evolution of alloys. In this paper, the recent development of the control of the solidification process by high magnetic fields is reviewed from the view point of uniform magnetic fields and magnetic field gradients.

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Influence of thermoelectric effects on the solid–liquid interface shape and cellular morphology in the mushy zone during the directional solidification of Al–Cu alloys under a magnetic field

Cited by 148 publications

References 7 publications

Dendritic growth velocities in an undercooled melt of pure nickel under static magnetic fields: A test of theory with convection

Dendritic growth velocities in an undercooled melt of pure nickel under static magnetic fields: A test of theory with convection

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

Solidified Structure Control of Metallic Materials by Static High Magnetic Fields

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