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L. X. LI1,2,* , X. B. BU1,2, L. Q. ZHANG1,2, B. W. ZHU1,2, R. XU1,2, S. P. WANG1,2
Numerical simulation of solidification grain structure is an effective alternative means in the prediction and controlling of the microstructure of castings other than actual casting experiment. The liquid phase diffusion coefficient was one of the most important factors in the microstructure simulation, and affected the grain morphology. The liquid phase diffusion coefficient was usually assumed to a constant in a wide variety of alloys. In the present paper, the diffusion coefficients of Al based melts were calculated by the Miedema model, Extended Miedema model and Eyring model in different temperatures. In addition, a cellular automaton finite element method was used to predict the solidification structure of an Al 2%Cu alloy and Al 9.75%Si 2%Cu alloy. Comparing the simulation results with the diffusion constant, the simulated results with calculated diffusion coefficient were in accord with the experimental ones well, and could accurately reflect the grains distribution, proportion, size of equiaxed and columnar grains..
Miedema model, Eying model, Diffusion coefficient, Microstructure.
L. X. LI, X. B. BU, L. Q. ZHANG, B. W. ZHU, R. XU, S. P. WANG, Diffusion coefficient of the Al based melt in the microstructure simulation, Optoelectronics and Advanced Materials - Rapid Communications, 7, 7-8, July-August 2013, pp.597-603 (2013).
Submitted at: July 21, 2012
Accepted at: July 11, 2013
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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