Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

China Foundry

卷:14

Shou-mei Xiong¹  Ang Zhang²  Zhi-peng Guo² 

[1] 1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;

[2] School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

关键词: natural convection;    lamellar width;    phase field model;    lattice Boltzmann method;   

DOI  :  10.1007/s41230-017-7186-8

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown