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Journal of Materials Science

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06-07-2021 | Metals & corrosion

Microstructure development in eutectic Al–Fe alloy during directional solidification under high magnetic fields at different growth velocities

Authors: Pengcheng Tang, Yuhang Tian, Sishuo Liu, Yupin Lv, Yifei Xie, Jinge Yan, Tie Liu, Qiang Wang

Published in: Journal of Materials Science | Issue 28/2021

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Abstract

In this study, the Al-1.9 wt.% Fe alloy was directionally solidified at different growth velocities under various high magnetic fields. The effect of high magnetic fields on microstructural evolution of the alloys during directional solidification and their dependence on the growth velocity were investigated. The microstructures near the transition growth regions of the alloys between two different growth velocities were observed. With increasing growth velocity, the microstructure exhibited a eutectic to cellular eutectic to hypoeutectic structure transformation. Applying high magnetic fields increased the spacing of the eutectic Al₃Fe phase and decreased the alignment degree of the eutectic Al₃Fe phase at 1 µm/s, decreased the size of the eutectic cells at 10 µm/s, and promoted development and branching of the primary Al dendrites at 100 µm/s. Near the transition growth region, applying high magnetic fields stopped the growth of existing eutectic Al₃Fe and promoted nucleation of the new eutectic Al₃Fe phase for 1–10 μm/s, and accelerated transformation of the growth behavior from cellular eutectic to hypoeutectic for 10–100 μm/s. The evolution of the eutectic growth behavior caused by the high magnetic fields can be attributed to suppression of convection and the corresponding decrease in solute migration owing to the Lorentz force.

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Title: Microstructure development in eutectic Al–Fe alloy during directional solidification under high magnetic fields at different growth velocities
Authors: Pengcheng Tang
Yuhang Tian
Sishuo Liu
Yupin Lv
Yifei Xie
Jinge Yan
Tie Liu
Qiang Wang
Publication date: 06-07-2021
Publisher: Springer US
Published in: Journal of Materials Science / Issue 28/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-021-06298-y

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