Lamellar eutectic growth under forced convection: A phase-field lattice-Boltzmann study based on a modified Jackson-Hunt theory

作者：Zhang, Ang; Du, Jinglian; Guo, Zhipeng^*; Xiong, Shoumei

来源：Physical Review E, 2018, 98(4): 043301.

DOI：10.1103/PhysRevE.98.043301

• LIQUID SURFACE ENERGIES
• MICROSTRUCTURE EVOLUTION
• WEAK CONVECTION
• SOLIDIFICATION
• FLOW
• EQUATION
• AL
• DYNAMICS
• SYSTEMS
• MORPHOLOGIES

Effect of forced convection on the lamellar eutectic growth was investigated by combining a modified Jackson-Hunt theory and a phase-field lattice-Boltzmann approach. Under the consideration of the asymmetrical tilting pattern and curvature effect, the classical eutectic Jackson-Hunt theory [Jackson and Hunt, Trans. Metall. Soc. AIME 236, 1129 (1966)] was modified to better understand the physical mechanism driving the eutectic growth with convection. Results showed that the eutectic growth velocity increased linearly with increasing undercooling and exhibited a parabola trend versus the inverse of initial lamellar spacing. The flow induced by a horizontal external force tilted the eutectic lamellae by altering the solute distribution near the interface. Under weak convection, the phase-field lattice-Boltzmann simulation results agreed well with those predicted by the modified Jackson-Hunt theory. But under strong convection, the consistency of the two results was largely dependent on the alloy parameters and convection intensity.

• 出版日期2018-10-2
• 单位清华大学