Microstructure Evolution and Solute Migration Behavior of Al-Si Eutectic Alloys During Directional Solidification Under a High Magnetic Field

doi:10.11900/0412.1961.2024.00080

Acta Metall Sin

2025, Vol. 61

Issue (11): 1615-1624 DOI: 10.11900/0412.1961.2024.00080

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Microstructure Evolution and Solute Migration Behavior of Al-Si Eutectic Alloys During Directional Solidification Under a High Magnetic Field

WU Yuxuan¹^,², TANG Ziyuan², ZHANG Baoze¹^,², GUO Xiaoyu¹, LUO Ying¹, LIU Tie¹(

), WANG Qiang¹^,²

1 Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
2 School of Metallurgy, Northeastern University, Shenyang 110819, China

Cite this article:

WU Yuxuan, TANG Ziyuan, ZHANG Baoze, GUO Xiaoyu, LUO Ying, LIU Tie, WANG Qiang. Microstructure Evolution and Solute Migration Behavior of Al-Si Eutectic Alloys During Directional Solidification Under a High Magnetic Field. Acta Metall Sin, 2025, 61(11): 1615-1624.

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Abstract

As an important metal material, the properties of eutectic alloy are mainly determined by solidification microstructures. The potential control effect of high magnetic field on metal solidification process has been gradually confirmed, making it highly significant to carry out the research on the theory of metal solidification under high magnetic field. In this study, the experiments of directional solidification and quenching of Al-12.7%Si (mass fraction) eutectic alloys without and with a 6 T high magnetic field at various growth velocities were carried out. The effects of the magnetic field and growth velocity on the solidified structures of the alloys and the solute migration behavior were investigated. It is found that with increasing growth velocity the alloy underwent a transformation of a coarsened eutectic to a refined eutectic, and then a hypoeutectic microstructure. While with the same growth velocity, applying a 6 T high magnetic field during the directional solidification process of the alloy could also induce the transformation from a coarsened eutectic to a refined eutectic, and then a hypoeutectic microstructure. The analyses of the quenched solid-liquid interface microstructure and solute distribution suggested that the high magnetic field induced microstructure transformation can be linked to the modification of the solute migration caused by the suppression of the convection by the Lorentz force. The above results indicate that similar with growth velocity, high magnetic field can be another parameter for controlling the solidification microstructures of eutectic alloys.

Key words: high magnetic field Al-Si eutectic alloy directional solidification solute migration

Received: 13 March 2024

ZTFLH:

TG113.12

Fund: National Natural Science Foundation of China(U2241230);National Natural Science Foundation of China(52127807)

Corresponding Authors: LIU Tie, professor, Tel: (024)83685967, E-mail: liutie@epm.neu.edu.cn

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	WU Yuxuan
	TANG Ziyuan
	ZHANG Baoze
	GUO Xiaoyu
	LUO Ying
	LIU Tie
	WANG Qiang

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https://www.ams.org.cn/EN/10.11900/0412.1961.2024.00080 OR https://www.ams.org.cn/EN/Y2025/V61/I11/1615

Fig.1 SEM images of the longitudinal section microstructures of Al-12.7%Si alloys directional solidified without or with a high magnetic field and at different solidification velocities (a-f) and corresponding local enlarged images (a1-f1) ( v —growth velocity, B —magnetic flux density)
(a, a1) 0 T, 5 μm/s (b, b1) 0 T, 50 μm/s (c, c1) 0 T, 200 μm/s (d, d1) 6 T, 5 μm/s (e, e1) 6 T, 50 μm/s (f, f1) 6 T, 200 μm/s

Fig.2 SEM images of the cross sectional microstructures of Al-12.7%Si alloys directional solidified without or with a high magnetic field and at different solidification velocities
(a) 0 T, 5 μm/s (b) 0 T, 50 μm/s (c) 0 T, 200 μm/s
(d) 6 T, 5 μm/s (e) 6 T, 50 μm/s (f) 6 T, 200 μm/s

Fig.3 XRD spectra of the cross section of Al-12.7%Si alloys directional solidified without (a) and with (b) a high magnetic field (6 T) and at different solidification velocities

Fig.4 SEM images of the quenched microstructures of Al-12.7%Si alloys directional solidified without or with a high magnetic field and at different solidification velocities (a-f) and corresponding locally enlarged images (a1-f1)
(a, a1) 0 T, 5 μm/s (c, c1) 0 T, 50 μm/s (e, e1) 0 T, 200 μm/s (b, b1) 6 T, 5 μm/s (d, d1) 6 T, 50 μm/s (f, f1) 6 T, 200 μm/s

Fig.5 Widths of the Si-enriched zone at the front of the solid-liquid interface during the directional solidification of Al-12.7%Si alloys solidified without or with a high magnetic field and at different solidification velocities

Fig.6 SEM images (a-f) and EPMA line scanning results of Si element (a1-f1) of solid-liquid interface of longitudinal section of Al-12.7%Si alloys directional solidified without or with a high magnetic field and at different solidification velocities
(a, a1) 0 T, 5 μm/s (b, b1) 0 T, 50 μm/s (c, c1) 0 T, 200 μm/s (d, d1) 6 T, 5 μm/s (e, e1) 6 T, 50 μm/s (f, f1) 6 T, 200 μm/s

Fig.7 Fractions of Al phase in the liquid phase zone of Al-12.7%Si alloys solidified with or without a high magnetic field and at different solidification velocities

Fig.8 Schematics of solute migration controlled by a high magnetic field (a-d) ( F_L—Lorentz force, v_e—motion direction of the metal melt)

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