Phase-field lattice-Boltzmann study on fully coupled thermal-solute-convection dendrite growth of Al-Cu alloy  

作　　者：Yin-qi Qiu Meng-wu Wu Xun-peng Qin Shou-mei Xiong 

机构地区：[1]Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China [2]Hubei Longzhong Laboratory,Xiangyang 441000,Hubei,China [3]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《China Foundry》2024年第2期125-136,共12页中国铸造（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52275370);the Key R&D Program of Hubei Province,China(Grant No.2022BAD100 and No.2021BAA048);the Open Fund of Hubei Longzhong Laboratory,China(Grant No.2022ZZ-04)。

摘　　要：Dendrite growth is a complex liquid-solid phase transition process involving multiple physical factors.A phase-field lattice-Boltzmann method was developed to simulate the two-and three-dimension dendrite growth of Al-Cu alloy.The effect of fully coupled thermal-solute-convection interaction on the dendrite growth was investigated by incorporating a parallel-adaptive mesh refinement algorithm into the numerical model.By accurately reproducing the latent heat release,solute diffusion and convective transport behaviors at the liquidsolid interface,the interaction mechanism among thermal-solute-convection transport as well as their coupling effects on the dendrite growth dynamics were discussed.The simulation results show that the release of latent heat slows down the dendrite growth rate,and both natural and forced convection disrupt the symmetrical growth of dendrites.Their combination makes the growth of dendrites more complex,capturing important physical aspects such as recalescence,dendrite tip splitting,dendrite tilting,dendrite remelting,and solute plume in the simulation case.Based on the robustness and powerful ability of the numerical model,the formation mechanisms of these physical aspects were revealed.

关 键 词：simulation phase field dendrite growth thermal-solute-convection interaction 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TP391.9[金属学及工艺—金属材料]