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Numerical Analysis of the Microstructure Evolution of Monotectic Alloys in Magnetic Field |
KANG Zhiqiang, WANG Engang, ZHANG Lin, HE Jicheng |
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819 |
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Cite this article:
KANG Zhiqiang WANG Engang ZHANG Lin HE Jicheng. Numerical Analysis of the Microstructure Evolution of Monotectic Alloys in Magnetic Field. Chin J Mater Res, 2011, 25(2): 124-128.
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Abstract A two–phase mathematical model for the solidification process of monotectic alloys through the miscibility gap was established. The effect of magnetic field on the microstructural evolutions of an Al–10%Bi hypermonotectic alloy was investigated, and the effect of temperature, velocity and second phase volume fraction distribution on the macrosegregation were analyzed. The results showed that the centrosymmetric distribution of temperature field in the magnetic field was more advantageous to the uniform distribution of second phase droplets. Because partial gravity force and Marangoni force were counteracted by the Lorentz force, the velocity field changed from the outward circumfluence to the moving downward slope form in the magnetic field, and the velocity reduced obviously, thus the gravity
segregation caused by strong convection was suppressed. Second phase volume fraction reduced in the specimen bottom in the magnetic field, and the macrosegregation was improved.
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Received: 30 August 2010
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Fund: Supported by National High Technology Research and Development Program of China No.2007AA03Z519, National Natural Science Foundation of China Nos.50574027, 50901019, the Research Fund for the Doctoral Program of Higher Education of China No.20070145062, and the 111 Project of China No.B07015. |
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