Influence of Growth Velocity on the Separation of Primary Silicon in Solidified Al-Si Hypereutectic Alloy Driven by a Pulsed Electric Current

Zhang, Yunhu; Ye, Chunyang; Xu, Yanyi; Zhong, Hao; Chen, Xiangru; Miao, Xincheng; Song, Changjiang; Zhai, Qijie

doi:10.3390/met7060184

Cited by 12 publications

(5 citation statements)

References 18 publications

(23 reference statements)

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“…The box size used to calculate both E% and DAS profiles is 0.5 mm in length and equal to the sample diameter in width. It is worth to mention that the measured DAS is not equal to the primary or secondary dendrite arm spacing but is a measurement of the average characteristic scale of the dendritic network [2,45].…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Modification of the microstructure by rotating magnetic field during the solidification of Al-7 wt.% Si alloy under microgravity

Mangelinck‐Noël

Zimmermann

et al. 2020

Journal of Alloys and Compounds

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Directional solidifications of Al-7 wt.% Si alloy were carried out under microgravity on board the International Space Station to investigate the impact of a rotating magnetic field (RMF) on the solidified microstructure. It has been found that the RMF significantly influences the solidified microstructure in the conditions corresponding to the lowest growth rate, whereas it has negligible influence on the microstructure under the highest growth rate, indicating that the RMF intensity and the forced liquid flow are too weak, compared to the solidification front velocity, to impact the microstructure. For the lowest growth rate applied, the RMF application results in a more uniform eutectic phase distribution and a smaller dendrite arm spacing. This is ascribed to the RMF induced forced liquid flow that makes more uniform Si concentration in the bulk liquid above the solid-liquid interface. Additionally, the RMF application possibly modifies the columnar dendritic network by changing dendrite growth directions. This observation can be attributed to the combined effect of the RMF induced forced liquid flow and of the thermoelectric magnetic force on the dendrites resulting from the application of the RMF as well.

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Section: Microstructure Characterizationmentioning

confidence: 99%

Modification of the microstructure by rotating magnetic field during the solidification of Al-7 wt.% Si alloy under microgravity

Mangelinck‐Noël

Zimmermann

et al. 2020

Journal of Alloys and Compounds

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“…Under the DC electric field, the grain morphology evolved in the form of equiaxed dendrites and the dendrite tip morphology gradually tended to become round or flat. Zhang et al [21] applied ECP to the directional solidification process of Al-20.5wt% Si alloy, resulting in higher strength forced flow, thereby promoting the segregation and separation of primary silicon. Li's [22] experimental results showed that the electromagnetic vibration volume force generated by the combined action of an AC electric field and magnetic field significantly improved the grain density of the solidified structure.…”

Section: Introductionmentioning

confidence: 99%

Study on the as-cast microstructure and mechanical properties of 35CrMo steel based on electric field control

Xiao,

Zhou,

Miao

et al. 2024

Mater. Res. Express

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Herein, the effect of current on the solidification microstructure and properties of 35CrMo structural steel has been studied. The effect of an electric field on the solidification structure of an ingot was investigated by immersing two parallel electrodes into the free surface of molten steel. Using the interaction between the current and melt as well as the Lorentz force generated by its own induced magnetic field, the whole region of the melt was covered with an eddy current. The numerical simulation of the ingot solidification process has been carried out and its influence on the inner flow field during the ingot solidification control process discussed. The results showed that an applied electric field caused turbulence inside the ingot, which drove the molten alloys to rotate and stir, refined the solidification structure, reduced the solidification defects, such as shrinkage cavity and segregation, and increased from 549.9 MPa at the top edge of the ingot and 411.4 MPa at the middle edge to 560.2 and 510.2 MPa, respectively. In addition, the electric field made the hardness and strength of each part of the ingot more uniform and improved the quality of its rigidity for the steel production process.

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“…Numerous efforts have been made to strengthen the segregation behavior of primary Si during the solidification of Al-Si alloy by applying physical fields, such as ultrasonic field [5], super gravity field [6], electric field [7][8][9], static magnetic field [10], and electromagnetic stirring [11][12][13][14][15][16][17][18][19][20]. Among various fields, electromagnetic stirring is the most efficient method used to realize the remote transmission of solute atoms [21,22] and even to control the directional growth of dendrite [23].…”

Section: Introductionmentioning

confidence: 99%

Controlling Segregation Behavior of Primary Si in Hypereutectic Al-Si Alloy by Electromagnetic Stirring

Zou

Tian

Zhang

et al. 2020

Metals

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Controlling the segregation behavior of primary Si in the solidification process of hypereutectic Al-Si alloy is crucial for enhancing the design ability of the solidification structure. To explore the separation condition and morphological evolution of primary Si in detail, a series of experiments concerning the coupling effect of a temperature field and electromagnetic stirring on the segregation behavior of primary Si were carried out. Experimental results show that the temperature field and fluid flow in the melt are two key points for controlling the segregation behavior of primary Si. The establishment of a temperature gradient in the Al-Si melt is a precondition for realizing the separation of primary Si. On the basis of the temperature gradient, the electromagnetic stirring can further strengthen the separation effect for primary Si, forming a Si-rich layer with 65~70 wt.% Si content. The formation of the Si-rich layer is a continuous growth process of primary Si by absorbing Si atoms from Al-Si melt with the help of electromagnetic stirring. The separation technology for primary Si is proposed to realize the segregation control of primary Si, which not only broadens the application of Al-Si alloys in the functionally gradient composites but also provides a low-cost supply strategy of Si raw materials for the solar photovoltaic industry.

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Influence of Growth Velocity on the Separation of Primary Silicon in Solidified Al-Si Hypereutectic Alloy Driven by a Pulsed Electric Current

Cited by 12 publications

References 18 publications

Modification of the microstructure by rotating magnetic field during the solidification of Al-7 wt.% Si alloy under microgravity

Modification of the microstructure by rotating magnetic field during the solidification of Al-7 wt.% Si alloy under microgravity

Study on the as-cast microstructure and mechanical properties of 35CrMo steel based on electric field control

Controlling Segregation Behavior of Primary Si in Hypereutectic Al-Si Alloy by Electromagnetic Stirring

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