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Phase Field Simulation of Microstructure Ternary Eutectic Solidification

Dalvand, Mehdi | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46521 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Tavakoli, Rouhollah
  7. Abstract:
  8. Physical and mechanical properties of cast alloys is partly a function of the morphology and volume fraction of phases from freezing. The microstructure of the eutectic solidification is function of physical properties (especially mobility and surface tension) and the volume fraction of phases involved in the evolution. The prediction of solidification microstructures will be very helpful for improving the mechanical properties of casting alloys and designing of new families of alloys. The theoretical study of the formation of eutectic microstructures is very difficult and almost impossible in general cases and empirical studies are expensive. The purpose of this study is to predict the eutectic solidification microstructures, especially in ternary eutectic systems, with computer simulation method. For eutectic solidification modeling, phase field method is used. After presenting the mathematical model of governing, respective equations were solved with using the fast Fourier transform.
    The result of this study is consist of simulated microstructures from the nucleation and growth in binary and ternary eutectic systems, and examining the effect of the physical properties of the resulting microstructures. Also the resulting microstructures were compared qualitatively with the microstructures obtained from experimental studies. The results of this comparison showed that most of the microstructures observed experimentally can be generated by the introduced model in the present study
  9. Keywords:
  10. Computer Simulation ; Phase Field Model ; Fast Fourier Transformation (FFT) ; Ternary Eutetic ; Spheralite

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