Alignment of weakly magnetic metals during solidification in a strong magnetic field

Sun, Zhi; Guo, Xiangming; Guo, Muxing; Zhang, Fei; Biest, Omer Van der; Blanpain, Bart

doi:10.1016/j.jallcom.2012.11.016

Cited by 19 publications

(7 citation statements)

References 34 publications

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“…Applied magnetic fields have the ability to modify significantly the solidification process of alloys in regards to the grain size, crystal growth, and the solute or inclusion distribution12345678910. As is well-known, static magnetic fields are capable of damping flow and enhancing the growth of columnar dendrite1112.…”

mentioning

confidence: 99%

Formation mechanism of axial macrosegregation of primary phases induced by a static magnetic field during directional solidification

Xi¹,

Fautrelle²,

Ren³

et al. 2017

Sci Rep

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Understanding the macrosegregation formed by applying magnetic fields is of high commercial importance. This work investigates how static magnetic fields control the solute and primary phase distributions in four directionally solidified alloys (i.e., Al-Cu, Al-Si, Al-Ni and Zn-Cu alloys). Experimental results demonstrate that significant axial macrosegregation of the solute and primary phases (i.e., Al2Cu, Si, Al3Ni and Zn5Cu phases) occurs at the initial solidification stage of the samples. This finding is accompanied by two interface transitions in the mushy zone: quasi planar → sloping → quasi planar. The amplitude of the macrosegregation of the primary phases under the magnetic field is related to the magnetic field intensity, temperature gradient and growth speed. The corresponding numerical simulations present a unidirectional thermoelectric (TE) magnetic convection pattern in the mushy zone as a consequence of the interaction between the magnetic field and TE current. Furthermore, a model is proposed to explain the peculiar macrosegregation phenomenon by considering the effect of the forced TE magnetic convection on the solute distribution. The present study not only offers a new approach to control the solute distribution by applying a static magnetic field but also facilitates the understanding of crystal growth in the solute that is controlled by the static magnetic field during directional solidification.

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mentioning

confidence: 99%

Formation mechanism of axial macrosegregation of primary phases induced by a static magnetic field during directional solidification

Xi¹,

Fautrelle²,

Ren³

et al. 2017

Sci Rep

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show abstract

“…Several techniques have been explored to induce grain alignment and crystallographic texturing in ceramic materials, including platelet seeding for templated grain growth, sintering additive incorporation, hot pressing, casting (slip/tape/gel), and magnetic alignment, the last of which has not been widely researched [20][21][22][23][24][25][26][27][28][29][30][31]. Ceramics are often paramagnetic or diamagnetic, responding weakly to magnetic fields and requiring strong magnetic fields to produce desired effects [22-23, 25-26, 29].…”

Section: Methodsmentioning

confidence: 99%

Energy coupled to matter for magnetic alignment of rare earth–doped alumina

Brennan

Moorehead

Blair

et al. 2016

Materials and Manufacturing Processes

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Energy Coupled to Matter concepts such as magnetic field-assisted processing were used to align rare earth-doped alumina ceramics in the presence of applied fields. The addition of gadolinium and ytterbium dopants to alumina increased the magnetic susceptibility anisotropies, and induced magnetic torques that led to significant alignment of ceramic particles under the application of magnetic fields as low as 1.8 Tesla. In comparsion, undoped alumina materials showed minimal alignment under applied field strengths as high as 9 Tesla. Density function theory modeling indicated that the specific dopant typed dictated changes in the magnetic properties of different rare earth-doped alumina systems by directly affecting the magnetic moment localization and magnetocrystalline anisotropy.

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“…Figure gives the solidification morphology of Al–Cu alloy with or without a high magnetic field. 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 …”

Section: Electromagnetic Field Effectsmentioning

confidence: 96%

Electromagnetic Field Assisted Metallic Materials Processing: A Review

Zhao¹,

Chai²,

Zheng³

et al. 2016

steel research int.

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Electromagnetic fields have been widely applied in the field of materials processing, preparation, and analysis. The effectiveness during such processing is, however, highly dependent on the physics of the applied electromagnetic field as well as the electromagnetic responses from the materials. In order to improve the efficiency of electromagnetic field processing, understanding the fundamentals as well as the engineering of the corresponding electromagnetic effects is crucial. Focusing on metallic materials, this research gives a critical overview and discussion on different electromagnetic effects. Subsequently, the electromagnetic responses in different electromagnetic technologies are further discussed. Specifically, the industrial application potential for inclusion removal from liquid metals is evaluated and the energy coefficient is noticed to be substantially improved by increasing the magnetic flux density.

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Alignment of weakly magnetic metals during solidification in a strong magnetic field

Cited by 19 publications

References 34 publications

Formation mechanism of axial macrosegregation of primary phases induced by a static magnetic field during directional solidification

Formation mechanism of axial macrosegregation of primary phases induced by a static magnetic field during directional solidification

Energy coupled to matter for magnetic alignment of rare earth–doped alumina

Electromagnetic Field Assisted Metallic Materials Processing: A Review

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