Materials Research | |
Numerical simulation of solute trapping phenomena using phase-field solidification model for dilute binary alloys | |
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】
CC BY
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