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Published in:
2012 | OriginalPaper | Chapter
Directional Solidification Microstructure Evolvement of Al-4.5Cu Alloy under Different Pulling Velocity Conditions
Authors : Chunhua Tang, Cui Liang, Jinjun Tang, Meng Xu, Guangming Zhang
Published in: Emerging Computation and Information teChnologies for Education
Publisher: Springer Berlin Heidelberg
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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.