Numerical simulation of solute trapping phenomena using phase-field solidification model for dilute binary alloys

Materials Research

Henrique Silva Furtado²  Américo Tristão Bernardes¹  Romuel Figueiredo Machado¹  Carlos Antônio Silva¹ 

[1] ,ArcelorMittal TubarãoSerra ES ,Brazil

关键词: phase-field;    solute trapping;    dilute alloys;    solidification;   

DOI  :  10.1590/S1516-14392009000300016

来源: SciELO

【 摘 要 】

Numerical simulation of solute trapping during solidification, using two phase-field model for dilute binary alloys developed by Kim et al. [Phys. Rev. E, 60, 7186 (1999)] and Ramirez et al. [Phys. Rev. E, 69, 05167 (2004)] is presented here. The simulations on dilute Cu-Ni alloy are in good agreement with one dimensional analytic solution of sharp interface model. Simulation conducted under small solidification velocity using solid-liquid interface thickness (2λ) of 8 nanometers reproduced the solute (Cu) equilibrium partition coefficient. The spurious numerical solute trapping in solid phase, due to the interface thickness was negligible. A parameter used in analytical solute trapping model was determined by isothermal phase-field simulation of Ni-Cu alloy. Its application to Si-As and Si-Bi alloys reproduced results that agree reasonably well with experimental data. A comparison between the three models of solute trapping (Aziz, Sobolev and Galenko [Phys. Rev. E, 76, 031606 (2007)]) was performed. It resulted in large differences in predicting the solidification velocity for partition-less solidification, indicating the necessity for new and more acute experimental data.

【 授权许可】

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