Modeling solidification microstructure and microsegregation of U-6%Nb binary alloy during solidification process

Acta Metall Sin

2007, Vol. 43

Issue (2): 217-224 DOI:

Research Articles

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Modeling solidification microstructure and microsegregation of U-6%Nb binary alloy during solidification process

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沈阳工业大学材料科学院工程学院

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. Modeling solidification microstructure and microsegregation of U-6%Nb binary alloy during solidification process. Acta Metall Sin, 2007, 43(2): 217-224 .

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Abstract An improved model of calculating solid fraction is presented in this paper that the solid fraction of solid/liquid interface zone can be expressed as an second order equation of one variable based on calculating phase diagram, instead of calculating the solid fraction based on the assumptions of the position and the shape of the solid/liquid interface, which make the physical meanings of the model more clearly. Using the model the solidification microstructure and solute microsegregation of U-6%Nb binary alloy are simulated. The simulated results show that Nb concentration in the initial nucleated position is high. As the solidification proceeds, Nb concentration of the nucleus decreases continuously due to the back diffusion in the solid phase. At the end of solidification, there are poor Nb concentration zones formed at the grains boundary where Nb concentration can be lower than 3%.

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Received: 14 July 2006

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I2/217

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