Modeling of Columnar-to-Equiaxed Transition in Solidified Al-Si Alloys

Abstract:

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A Cellular-Automaton Finite-Volume-Method (CAFVM) algorithm has been developed, coupling with macroscopic model for heat transfer calculation and microscopic models for nucleation and growth. The solution equations have been solved to determine the timedependent constitutional undercooling and interface retardation during solidification. The constitutional undercooling is then coupled into the CAFVM algorithm to investigate both the effects of thermal and constitutional undercooling on columnar growth and crystal selection in the columnar zone, and formation of equiaxed crystals in the bulk liquid. The model cannot only simulate microstructures of alloys but also investigates nucleation mechanisms and growth kinetics of alloys solidified with various solute concentrations and solidification morphologies.

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

3141-3144

DOI:

10.4028/www.scientific.net/MSF.475-479.3141

Citation:

X. Yao et al., "Modeling of Columnar-to-Equiaxed Transition in Solidified Al-Si Alloys", Materials Science Forum, Vols. 475-479, pp. 3141-3144, 2005

Online since:

January 2005

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$35.00

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