Revealing influence mechanism of a transverse static magnetic field on the refinement of primary dendrite spacing during directional solidification

Shen, Zhe; Zhou, Bangfei; Shen, Zhe; Zheng, Tianxiang; Ren, Weili; Lei, Zuosheng; Ren, Zhongming

doi:10.1016/j.jcrysgro.2019.04.010

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…The simulation results of the characteristics of the flow field are displayed in the right side of Figure 2a-e. From the right side of Figure 2a, the flow pattern in the Al-30Si melt under no RMF was characterized by a relatively strong natural convection, when the maximum flow velocity reaches around 0.018 m/s in the liquid. To determine more fully and strongly the role of melt flow on the segregation behavior of impurities, natural convection was further suppressed by introducing static magnetic field (SMF) with the fundamental structure similar to the experimental device in the literature [27]. It was evident that the melt flow perpendicular to the direction of magnetic field was effectively suppressed, resulting in a significant reduction of maximum flow velocity~0.007 m/s (right side of Figure 2b).…”

Section: Melt Flow Characteristics and Temperature Field Distributionmentioning

confidence: 96%

Enhancing Segregation Behavior of Impurity by Electromagnetic Stirring in the Solidification Process of Al-30Si Alloy

Zou

Han

Zhang

et al. 2020

Metals

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Increasing the removal efficiency of impurities during non-equilibrium solidification of hypereutectic Al-Si alloy remains a great challenge for the upgrading of metallurgical silicon (MG-Si) to solar grade Si (SOG-Si). Hence, a manageable method was provided to enhance the segregation behavior of impurities at the interface front of primary Si/Al-Si melt by introducing a rotating magnetic field (RMF) in the present work. Experimental results showed that electromagnetic stirring can improve the removal efficiency of impurities while achieving the separation of primary Si. The apparent segregation coefficients of the major impurities Fe, Ti, Ca, Cu, B and P were reduced to 7.5 × 10−4, 4.6 × 10−3, 7.9 × 10−3, 3.5 × 10−3, 0.1 and 0.16, respectively, under RMF of 25 mT and cooling rate of 2.5 °C/min. We confirmed that improving the transport driving force of impurities in the growth interface front of primary Si is an effective way to improve the segregation behavior of impurities, which would bring us one step closer to exploiting the economic potential of the Al-Si alloy solidification refining.

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Section: Melt Flow Characteristics and Temperature Field Distributionmentioning

confidence: 96%

Enhancing Segregation Behavior of Impurity by Electromagnetic Stirring in the Solidification Process of Al-30Si Alloy

Zou

Han

Zhang

et al. 2020

Metals

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“…TEM convection in the melt; microstructure, electrical resistivity, magnetoresistance [19,20] Al-Si 0-12 Distribution of primary silicon under uniform and gradient magnetic field; arm spacing, eutectic lamellar spacing; refinement of primary silicon [21][22][23] Al-Mg 0, 8.8 Solute segregation [24] Al-Fe 0-12 Distribution of primary phase [25][26][27][28] Al-Ni 0-2 Microstructural evolution [29] Al-Zn 0, 5 Dendrite morphology and growth orientation [30] Sn-Bi 0-0.55 TEM convection in the melt; microstructural evolution and solute distribution; refinement of arm spacing [31][32][33] Table 1. Cont.…”

Section: B (T) Research Content Referencesmentioning

confidence: 99%

“…These well-known contactless forces and energy effects deepen our understanding of controlling the solidified microstructure using SMF and offer promising applications in the industrial area. To investigate the effect of a high SMF on the solidification process of ETAs, various master alloys, such as Al-Cu [14][15][16][17], Nb-Fe [18], Cu-Ag [19,20], Al-Si [21][22][23], Al-Mg [24], Al-Fe [25][26][27][28], Al-Ni [29], Al-Zn [30], Sn-Bi [31][32][33], Pb-Sn [34][35][36], Zn-Mg [37,38], Mg-Nd [39], Co-B [40,41], Co-Sn [42], Mn-Sb [43], Bi-Mn [44], Al-Si-Fe [45], Al-Cu-Ag [46], Al-Cu-Si [47], and NiAl-Cr(Mo)-Hf [48] have been selected for investigation and the research contents are listed in Table 1. During the investigation of solidification of ETAs under the SMF, the solidification theories under the SMF were gradually established.…”

Section: Introductionmentioning

confidence: 99%

Review on Eutectic-Type Alloys Solidified under Static Magnetic Field

et al. 2023

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Processing metallic alloys under a static magnetic field (SMF) has garnered significant attention over the past few decades. SMFs can influence both the thermodynamics and kinetics of the solidification process by introducing extra force and energy. Eutectic-type alloys (ETAs) are commonly used as research materials under SMFs due to their featured microstructures. This review aims to present theoretical and experimental results regarding ETAs under SMFs, from post-analysis to in situ observation, to demonstrate the effects of magnetic phenomena such as magnetic braking, thermoelectric magnetic convection, magnetic gradient force, and magnetic energy on the thermodynamics and kinetics of microstructural evolution. In this paper, we adopt a hybrid approach between a review and an overview to comprehensively examine the effect of SMFs on the solidification process. Firstly, we provided a concise review of the historical research on the SMF’s impact on solidification in the literature. Next, we elucidated the basic physical principles of an SMF in material processing, followed by an introduction of numerous laboratory and industrial experiments that have utilized SMFs. Finally, we summarized the effects of SMFs on solidification in the past and provide insights into future research directions.

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“…In recent years, an important new technique called high magnetic field (HMF) processing has been applied to material processing as a non-contact method [12][13][14], especially during solidification [15,16], which contributes to the influencing of secondary particle migration/orientation [17] and liquid metal motion and convection [18,19] to achieve more accurate control over the microstructure of materials [20,21]. The development of superconductivity technology has made it easy to obtain HMF of 10 T and above, which has promoted the application of HMFs in materials science and engineering and is therefore regarded as a new opportunity in this field [22,23].…”

Section: Introductionmentioning

confidence: 99%

Solidification of Immiscible Alloys under High Magnetic Field: A Review

Chen

Wang

et al. 2021

Metals

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Immiscible alloy is a kind of functional metal material with broad application prospects in industry and electronic fields, which has aroused extensive attention in recent decades. In the solidification process of metallic material processing, various attractive phenomena can be realized by applying a high magnetic field (HMF), including the nucleation and growth of alloys and microstructure evolution, etc. The selectivity provided by Lorentz force, thermoelectric magnetic force, and magnetic force or a combination of magnetic field effects can effectively control the solidification process of the melt. Recent advances in the understanding of the development of immiscible alloys in the solidification microstructure induced by HMF are reviewed. In this review, the immiscible alloy systems are introduced and inspected, with the main focus on the relationship between the migration behavior of the phase and evolution of the solidification microstructure under HMF. Special attention is paid to the mechanism of microstructure evolution caused by the magnetic field and its influence on performance. The ability of HMF to overcome microstructural heterogeneity in the solidification process provides freedom to design and modify new functional immiscible materials with desired physical properties. This review aims to offer an overview of the latest progress in HMF processing of immiscible alloys.

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Revealing influence mechanism of a transverse static magnetic field on the refinement of primary dendrite spacing during directional solidification

Cited by 9 publications

References 18 publications

Enhancing Segregation Behavior of Impurity by Electromagnetic Stirring in the Solidification Process of Al-30Si Alloy

Enhancing Segregation Behavior of Impurity by Electromagnetic Stirring in the Solidification Process of Al-30Si Alloy

Review on Eutectic-Type Alloys Solidified under Static Magnetic Field

Solidification of Immiscible Alloys under High Magnetic Field: A Review

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