1. Phase-Field Lattice-Boltzmann Study for α-Mg Dendrite Growth of Mg-5wt%Zn Alloy with Forced Convection
- Author
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Chen, Wei-Peng, Hou, Hua, Zhang, Yun-Tao, Liu, Wei, and Zhao, Yu-Hong
- Abstract
Melt flow can significantly change the transport of heat and solute, dendrite growth. In this work, a phase-field lattice-Boltzmann model was developed to study α-Mg dendrite growth of Mg-5wt%Zn alloy with forced convection. Results show that the existence of forced convection and overlap of thermal and solute fields makes thermal and solute fields distribution nonuniform. Thus, the symmetry of dendrite morphology is destroyed. The solid temperature and concentration of the downstream dendrite tip front with forced convection are higher than that without forced convection, while the concentration of the upstream dendrite tip front is lower. The solute transport through melt flow will be hindered by developed sidebranching. With flow velocity increase, the upstream temperature gradient and thickness of the downstream solute enrichment layer increase gradually, while the downstream temperature gradient and thickness of the upstream solute enrichment layer decrease gradually. Meanwhile, the upstream dendrite tip velocity will increase gradually, while the downstream dendrite tip velocity will decrease at first and then unchanged. This study is helpful to establish the relationship between α-Mg dendrite growth and melt flow, which is beneficial to understand the role of melt flow on dendrite morphologies.
- Published
- 2023
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