Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt
Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt
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自然对流熔体中层状共晶生长的相场晶格玻尔兹曼研究
DOI：
10.1007/s41230-017-7186-8
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发表时间：
2017-09-01
期刊：
影响因子：
1.6
通讯作者：
Xiong, Shou-mei
中科院分区：
文献类型：
--
作者：
Zhang, Ang;Guo, Zhi-peng;Xiong, Shou-mei
本研究采用相场晶格玻尔兹曼法研究了自然对流对Al-Cu共晶合金片层共晶生长的影响。在不影响计算精度的前提下，采用鲁棒并行自适应网格细化算法提高计算效率。结果表明，自然对流的存在会影响过冷的生长，从而通过调节片层宽度来控制界面形状。特别是，通过改变溶质膨胀系数的大小，自然对流的强度发生了变化。讨论并比较了无对流条件下的微观结构。
In the present study, the influence of natural convection on the lamellar eutectic growth is determined by a phase-field-lattice Boltzmann study for Al-Cu eutectic alloy. The mass difference resulting from concentration difference led to the fluid flow, and a robust parallel and adaptive mesh refinement algorithm was employed to improve the computational efficiency without any compromising accuracy. Results show that the existence of natural convection would affect the growth undercooling and thus control the interface shape by adjusting the lamellar width. In particular, by alternating the magnitude of the solute expansion coefficient, the strength of the natural convection is changed. Corresponding microstructure patterns are discussed and compared with those under no-convection conditions.