Effect of a high magnetic field on the microstructure in directionally solidified Al–12wt%Ni alloy

The effect of a 6T high magnetic field on the microstructure of directionally solidified NiAl-Cr (Mo)-Si near-eutectic alloy was investigated at the withdrawal rates of 2, 10 and 50 μm/s. The results showed that the microstructure evolved from planar eutectic to primary NiAl dendrites + cellular eutectic and then to dendritic eutectic with the increasing withdrawal rate. When the magnetic field was imposed, the well-aligned eutectic lamellae were disturbed and transformed into a wavy one at 2 μm/s. When the withdrawal rate increased to 10 μm/s, the application of the magnetic field destroyed the primary NiAl dendrite array and caused the occurrence of columnar-to-equiaxed transition (CET) of the NiAl dendrites. The volume fraction of primary dendrites also decreased. In addition, the width of intercellular/interdendritic regions decreased in cellular/dendritic eutectic structures when directionally solidified under the magnetic field. The above results should be attributed to the combined action of the thermoelectric magnetic force and the thermoelectric magnetic convection.

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Effect of a high magnetic field on the morphology of the primary dendrite in directionally solidified Pb-25 at% Bi peritectic alloy

Materials Letters ◽

10.1016/j.matlet.2015.06.126 ◽

2015 ◽

Vol 160 ◽

pp. 366-370 ◽

Cited By ~ 5

Author(s):

Zhenyuan Lu ◽

Yves Fautrelle ◽

Zhongming Ren ◽

Xionggang Lu ◽

Xi Li

Keyword(s):

Magnetic Field ◽

High Magnetic Field ◽

Primary Dendrite ◽

Directionally Solidified ◽

Peritectic Alloy

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Effect of an axial high magnetic field on the microstructure in directionally solidified Pb–Sn eutectic alloy

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2008.04.043 ◽

2008 ◽

Vol 310 (15) ◽

pp. 3584-3589 ◽

Cited By ~ 5

Author(s):

Xi Li ◽

Zhongming Ren ◽

Yves Fautrelle

Keyword(s):

Magnetic Field ◽

High Magnetic Field ◽

Eutectic Alloy ◽

Directionally Solidified

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Effect of a high magnetic field on the microstructure in directionally solidified two-phase Ni3Al alloys

Materials Letters ◽

10.1016/j.matlet.2016.11.095 ◽

2017 ◽

Vol 189 ◽

pp. 131-135 ◽

Cited By ~ 2

Author(s):

Huan Liu ◽

Weidong Xuan ◽

Xinliang Xie ◽

Jianbo Yu ◽

Jiang Wang ◽

...

Keyword(s):

Magnetic Field ◽

High Magnetic Field ◽

Directionally Solidified ◽

Two Phase

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Enhancement of Faceted Growth of Primary Al3Ni Phase in High Magnetic Field

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.642 ◽

2013 ◽

Vol 750-752 ◽

pp. 642-646

Author(s):

Chuan Jun Li ◽

Long Chen ◽

Zhong Ming Ren

Keyword(s):

Magnetic Field ◽

Thermal Analysis ◽

Differential Thermal Analysis ◽

Crystal Growth ◽

High Magnetic Field ◽

Driving Force ◽

Primary Phase ◽

Morphology Transition ◽

Ni Alloy ◽

The Magnetic Field

Faceted growth of primary Al3Ni phase in the hypereutectic Al-Ni alloy in a high magnetic field was investigated. It was found that faceted growth of primary Al3Ni phase was enhanced in the presence of the magnetic field. However, the fibrous to granular transition of Al-Al3Ni eutectics occurred. The undercooling of primary and eutectic phases during solidification was measured using differential thermal analysis. It was showed that the undercooling of primary phase was hardly changed but that of eutectics markedly increased in the magnetic field. According to Cahn theory of crystal growth, the critical driving force was used to satisfactorily explain the morphology transition in the magnetic field.

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