PF-LBM耦合模型下Al-Cu合金的枝晶生长和气泡形成  

Dendrite growth and bubble formation of Al-Cu alloys under PF-LBM coupling model

作　　者：朱昶胜[1,2] 雷瑶 雷鹏 高梓豪 赵博睿 ZHU Chang-sheng;LEI Yao;LEI Peng;GAO Zi-hao;ZHAO Bo-rui(School of Computer and Communication,Lanzhou Univ.of Tech.,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Network&Information Center,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]兰州理工大学网络与信息中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2024年第1期19-26,共8页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(52161002,51661020)。

摘　　要：基于Shan-Chen多相流的格子玻尔兹曼方法模拟复杂多相流系统,探索气泡在液相中的生长和运动.研究了Al-4.0wt.%Cu合金在凝固过程中枝晶与气泡的相互作用,各向异性对凝固组织的影响以及枝晶与气泡共存时溶液密度的变化情况.结果表明:在定向凝固枝晶生长模型中,气泡先在枝晶底部析出,压差导致气泡上升,流动的过程中会与枝晶产生相互作用且会出现气泡合并与消失的情况,在枝晶间密集通道处大气泡会变成蠕虫形状.模拟区域的高长比会影响枝晶和气泡的生长情况,当高长比较小时更容易产生短而小的气泡,高长比较大时更容易产生蠕虫状气泡.在等轴枝晶生长模型中,气泡在枝晶间析出,随着枝晶的生长,气泡同样会发生合并与消失的情况,并且在受到挤压时发生形变.The complex multiphase flow system was simulated by the Lattice Boltzmann Method based on Shan-Chen multiphase flow to explore the growth and motion of bubbles in the liquid phase.The interaction between dendrites and bubbles during solidification of Al-4.0wt%Cu alloys was studied,along with the effect of anisotropy on solidification organization and the variation in solution density when dendrites coexist with bubbles.The results showed that in the directional solidification dendrite growth model,the bubbles initially precipitate at the bottom of the dendrite.Pressure differentials drive bubble ascent,leading to interactions with dendrites during flow,resulting in instances of bubble coalescence and disappearance.In densely channeled regions between dendrites,larger bubbles become worm-shaped.The height-to-length ratio of the simulated area affects the growth of dendrites and bubbles,and the short,small bubbles more is likely to be produced when the height-to-length ratio is small,but the worm-like bubbles more is likely to be produced when the height-to-length ratio is large.In the isometric dendrite growth model,bubbles are precipitated between the dendrites,as the dendrites grow,they also merge,disappear and undergo deformation when they are squeezed.

关 键 词：相场模拟 格子玻尔兹曼方法 气泡 Al-4.0wt.%Cu合金 

分 类 号：TG111[金属学及工艺—物理冶金]