Directional Solidification Microstructure Evolvement of Al-4.5Cu Alloy under Different Pulling Velocity Conditions
Directional solidification microstructure of Bridgman system was simulated using phase-field method, and different pulling velocity calculated results were obtained. When the pulling velocity is 0.08 cm/s, the columnar crystals competitively grow. The space between columnar crystals is the biggest. When the pulling velocity is 0.90 cm/s, the columnar crystals become thinner and competitively grow all the time, and the microsegregation is bigger. When the pulling velocity is 1.60 cm/s, planar interface comes back, and solute trapping takes place. The columnar crystals become much thinner, and microsegregation decreases. When the pulling velocity is 1.80 cm/s, the grain boundary of columnar crystals becomes unconspicuous, and the degree of microsegregation approaches 1. At the same time, the transverse solute profiles is also studied in this paper.
KeywordsNumerical Simulation Directional solidification phase-field model microsegregation Al-4.5Cu alloy
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