High Magnetic Field-Induced Formation of Banded Microstructures in Lamellar Eutectic Alloys During Directional Solidification

被引:0
作者
Xi Li
Yves Fautrelle
Annie Gagnoud
Zhongming Ren
Rene Moreau
机构
[1] Shanghai University,State Key Laboratory of Advanced Special Steels
[2] SIMAP-EPM-Madylam/G-INP/CNRS,undefined
[3] UJF,undefined
[4] PHELMA,undefined
来源
Metallurgical and Materials Transactions A | 2016年 / 47卷
关键词
Directional Solidification; High Magnetic Field; Eutectic Alloy; Magnetic Field Intensity; Eutectic Point;
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学科分类号
摘要
The influences of high magnetic field (up to 12 T) on the morphology of Pb-Sn and Al-Al2Cu lamellar eutectics during directional solidification were investigated. The experimental results indicate that, along with a decrease in eutectic spacing, the banded structure forms at lower growth speeds under high magnetic field and the band spacing decreases as the magnetic field increases. Moreover, the application of a magnetic field enriches the Cu solute in the liquid ahead of the liquid/solid interface during directional solidification of an Al-Al2Cu eutectic alloy. The effects of high magnetic field on the eutectic points of non-ferromagnetic alloys and the stress acting on the eutectic lamellae during directional solidification have been studied. Both thermodynamic evaluation and DTA measurements reveal that the high magnetic field has a negligible effect on the eutectic points of non-ferromagnetic alloys. However, the high magnetic field caused an increase of the nucleation temperature and undercooling. The numerical results indicate that a considerable stress is produced on the eutectic lamellae during directional solidification under high magnetic field. The formation of a banded structure in a lamellar eutectic during directional solidification under high magnetic field may be attributed to both the buildup of the solute in the liquid ahead of the liquid/solid interface and the stress acting on the eutectic lamellae.
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页码:4038 / 4052
页数:14
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