Formation mechanism of ring-like segregation and structure during directional solidification under axial static magnetic field

Qingdong Zhong ¹Huaiyu Zhong ²Hongbo Han ¹Mingyong Shu ²Long Hou ²Yanyan Zhu ³Xi Li⁴

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作者信息

1. Panzhihua University,Panzhihua 417000,China;State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200072,China
2. State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200072,China
3. Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China
4. State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200072,China;Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China
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Abstract

The effect of the axial static magnetic field on the macro-segregation and structure in the Al-Cu and Ni-Mn-Ga alloys during directional solidification is investigated experimentally and numerically.It is found that the ring-like segregation and structure in the above-mentioned two alloys form during directional solidification at a certain growth speed under a moderate magnetic field.For the Al-Cu and Ni-Mn-Ga alloys,the moderate values of the magnetic field under which the ring-like structure forms are about 0.5 T and 1.0 T at respective growth speed of 10 μm/s and 5 μm/s.Further,the distributions of the flow and solute in the Al-Cu alloy during directional solidification under the axial static magnetic field is numer-ically simulated.Numerical results reveal that the rotary thermoelectric(TE)magnetic convection forms in the mushy zone during directional solidification under an axial magnetic field.This flow will induce the formation of the ring-like macro-segregation and structure.Changes in structures under the mag-netic field in the experimental results are in good agreement with the distributions of the TE magnetic convection and solute in the numerical results.Therefore,the formation of the ring-like structure and segregation under the magnetic field should be attributed to the solute redistribution induced by the TE magnetic convection.

Key words

Ring-like segregation and structure/Magnetic field/Directional solidification

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基金项目

National foundation of Science(51690164)

National foundation of Science(51805321)

Shanghai Science and Technology Committee Grant(19XD1401600)

Shanghai Science and Technology Committee Grant(19010500300)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量21

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