Phase-Field Lattice-Boltzmann Study for α-Mg Dendrite Growth of Mg-5wt%Zn Alloy with Forced Convection  

作　　者：Wei-Peng Chen Hua Hou Yun-Tao Zhang Wei Liu Yu-Hong Zhao 

机构地区：[1]School of Materials Science and Engineering,Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-Performance Al/Mg Alloy Materials,North University of China,Taiyuan,030051,China [2]Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing,100083,China [3]School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,China [4]Institute of Materials Intelligent Technology,Liaoning Academy of Materials,Shenyang,110004,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第11期1791-1804,共14页金属学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52074246,52275390,52205429,52201146);the National Defense Basic Scientific Research Program of China(Nos.JCKY2020408B002,WDZC2022-12);the Key Research and Development Program of Shanxi Province(Nos.202102050201011,202202050201014);the Science and Technology Major Project of Shanxi Province(Nos.20191102008,20191102007);the Guiding Local Science and Technology Development Projects by the Central Government(Nos.YDZJSX2022A025,YDZJSX2021A027).

摘　　要：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 studyα-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 betweenα-Mg dendrite growth and melt flow,which is beneficial to understand the role of melt flow on dendrite morphologies.

关 键 词：Dendrite growth Mg-Zn alloy Forced convection Phase-field method Lattice-Boltzmann method 

分 类 号：TG146.22[一般工业技术—材料科学与工程]