Modeling of Microstructure and Microsegregation in Solidification of Multi-Component Alloys |
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| Authors: | M-F Zhu W Cao S-L Chen C-P Hong Y A Chang |
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| Affiliation: | (1) School of Materials Science and Engineering, Southeast University, Nanjing, 210096, China;(2) Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Avenue, Madison, WI, USA;(3) CompuTherm LLC, 437 S. Yellowstone Dr., Suite 217, Madison, WI, USA;(4) Center for Computer-Aided Materials Processing (CAMP), Department of Metallurgical Engineering, Yonsei University, Shinchon-dong 134, Seodaemun-ku, Seoul, 120-749, Korea |
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| Abstract: | Driven by industrial demand, extensive efforts have been made to investigate microstructure evolution and microsegregation
development during solidification of multicomponent alloys. This paper briefly reviews the recent progress in modeling of
microstructures and microsegregation in solidification of multicomponent alloys using various models including micromodel,
phase field, front tracking, and cellular automaton approaches. A two-dimensional modified cellular automaton (MCA) model
coupled with phase diagram software PanEngine is presented for the prediction of microstructures and microsegregation in the
solidification of ternary alloys. The model adopts MCA technique to simulate dendritic growth. The thermodynamic data needed
for determining the dynamics of dendritic growth are calculated with PanEngine. After validating the model by comparing the
simulated values with the prediction of the Scheil model for solute profiles in the primary dendrites as a function of solid
fraction, the model was applied to simulate the microstructure and microsegregation in the solidification of Al-rich ternary
alloys. The simulation results demonstrate the capabilities of the present model not only to simulate realistic dendrite morphologies,
but also to predict quantitatively the microsegregation profiles in the solidification of multi-component alloys.
This article was presented at the Multi-Component Alloy Thermodynamics Symposium sponsored by the Alloy Phase Committee of
the joint EMPMD/SMD of The Minerals, Metals, and Materials Society (TMS), held in San Antonio, Texas, March 12-16, 2006, to
honor the 2006 William Hume-Rothery Award recipient, Professor W. Alan Oates of the University of Salford, UK. The symposium
was organized by Y. Austin Chang of the University of Wisconsin, Madison, WI, Patrice Turchi of the Lawrence Livermore National
Laboratory, Livermore, CA, and Rainer Schmid-Fetzer of the Technische Universitat Clausthal, Clauthal-Zellerfeld, Germany. |
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| Keywords: | cellular automaton microsegregation microstructure modeling multi-component alloys PanEngine solidification |
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