Directional growth behavior of α(Al) dendrites during concentration-gradient-controlled solidification process in static magnetic field

A numerical simulation study has been carried out to examine the effect of a static magnetic field on the solidification process of an alloy. A mathematical model, based on the continuum model, was developed for the computation of a transient double-diffusive fluid flow under Lorentz body force. The model includes conservation of mass and momentum, heat, species and electrical charge balance equations. The simulation domain was selected as a cavity filled with a metallic alloy and differentially heated, which may be taken as a Bridgman model domain used in the crystal growth process. The solution is carried out by using a Finite Volume Method. Study of the direction and the intensity of the applied magnetic field effects on stabilizing the double diffusive flow field were also carried out. Simulation results indicate that the use of a static, magnetic field in this growth setup is effective in suppressing natural convection in the solution.

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Influences of Alternating Magnetic Fieldson the Growth Behavior and Distribution of the Primary Fe Phasein Cu-14Fe Alloys during the Solidification Process

Metals ◽

10.3390/met8080571 ◽

2018 ◽

Vol 8 (8) ◽

pp. 571 ◽

Cited By ~ 2

Author(s):

Jin Zou ◽

De-Ping Lu ◽

Ke-Ming Liu ◽

Qing-Feng Fu ◽

Zhe Zhou

Keyword(s):

Magnetic Field ◽

Growth Process ◽

Solidification Process ◽

Growth Behavior ◽

Solidification Structure ◽

Combined Effects ◽

Electromagnetic Parameter ◽

Grain Distribution ◽

Hole Defects ◽

Spherical Grains

An alternating magnetic field (AMF) was applied during the solidification process of the Cu-14Fe alloy and the effect of the electromagnetic parameter, which impact the model and solidification technique of the solidification structure that were analyzed. Results show that an AMF applied during the solidification process significantly reduced macro-segregation and gas hole defects. During the growth process of the primary Fe phase, the AMF impacted the nucleation of detached grains and fusing dendrites. Specifically, the developed Fe dendrites were transformed to rosettes or spherical grains in the presence of an applied AMF while the grain distribution was more disperse and uniform. It was found that the growth behavior of Fe grains under AMF depended upon the combined effects of the electromagnetic force and electromagnetic heat.

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Effects of high static magnetic field on the microstructure of Zn-Bi monotectic alloys during directional solidification process

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.161670 ◽

2021 ◽

pp. 161670

Author(s):

Bangfei Zhou ◽

Wenhao Lin ◽

Ying Liu ◽

Tianxiang Zheng ◽

Yunbo Zhong ◽

...

Keyword(s):

Magnetic Field ◽

Directional Solidification ◽

Static Magnetic Field ◽

Solidification Process ◽

Directional Solidification Process

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Investigation of solid/liquid interface evolution in the solidification process of liquid metal in an annulus crucible at the presence of static magnetic field: numerical study

Journal of the Brazilian Society of Mechanical Sciences and Engineering ◽

10.1007/s40430-019-1906-5 ◽

2019 ◽

Vol 41 (10) ◽

Author(s):

Vahid Ahmadpour ◽

Iraj Mirzaei ◽

Sajad Rezazadeh ◽

Nima Ahmadi

Keyword(s):

Magnetic Field ◽

Liquid Metal ◽

Static Magnetic Field ◽

Numerical Study ◽

Solidification Process ◽

Liquid Interface ◽

Interface Evolution ◽

Solid Liquid Interface ◽

Solid Liquid

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Effect of Static Magnetic Field on Distribution of Elements in the Fe-S, Fe-Si, and Fe-Mn Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.367 ◽

2011 ◽

Vol 194-196 ◽

pp. 367-370

Author(s):

Hai Chuan Wang ◽

Zhi You Liao ◽

Rui Peng Pang ◽

Peng Hong ◽

Shi Jun Wang ◽

...

Keyword(s):

Magnetic Field ◽

Chemical Composition ◽

Optical Microscopy ◽

Static Magnetic Field ◽

Solidification Process ◽

Original Position ◽

Migration Behavior ◽

Position Analysis ◽

Distribution Of Elements ◽

The Magnetic Field

Three binary Fe-based alloys Fe-S, Fe-Si, and Fe-Mn has been designed and melted in order to investigate the effect of static magnetic field on the migration behavior and distribution of the three elements during the solidification process in this study, and microstructure and chemical composition on the samples have been inspected by optical microscopy and Original Position Analysis technologies. It has been found that the magnetic field can effectively change the distribution of S, Si and Mn, and the migration behaviors of the three elements are different.

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The influence of a magnet field on sulfur removal from liquid iron by hydrogen plasma arc melting

Modern Physics Letters B ◽

10.1142/s021798492050030x ◽

2021 ◽

Author(s):

Yujia Zhang ◽

Yang Kong ◽

Xiliang Guo ◽

Jiang Wang ◽

Zhongming Ren ◽

...

Keyword(s):

Magnetic Field ◽

Sulfur Content ◽

Static Magnetic Field ◽

Hydrogen Plasma ◽

Dead Zone ◽

Sulfur Removal ◽

Solidification Process ◽

Plasma Arc ◽

Hydrogen Atoms ◽

Arc Melting

In this work, the static magnetic field was applied to plasma arc melting (PAM) method. The influence on sulfur removal from iron by Ar-20%H2 (PAM) was investigated experimentally. The results show that, sulfur content decreases more noticeably with the magnet field. The mechanism of sulfur removal by hydrogen plasma arc melting (HPAM) was found to obey a first-order rate law. From kinetic analysis, the adoption of magnet field enhanced purification efficiency about 45% under the same conditions. The numerical simulations were necessarily carried out to investigate the fluid flows of the melt. The results show that the magnet field changes the flow regime and strengthens the flow velocity of the melt. Moreover, the dead zone in melt by typical HPAM was eliminated. It is reasonable that dissolved sulfur atoms transferring to the top interface to react with active hydrogen atoms was promoted. In addition, during solidification process, thermoelectric magnetic (TEM) flows promote solute atoms that discharged from the solid–liquid interface moving to the upside of specimen. As a consequence, iron with much lower sulfur content could be obtained at the bottom of specimens, and sulfur removal was enhanced further during solidification under a static magnetic field.

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