金属学报  2007, Vol. 43 Issue (3): 240-248

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有外加相存在时Al-Si合金枝晶微观组织数值模拟

李斌;许庆彦;柳百成

清华大学机械工程系

Numerical simulation of dendrite microstructure for Al-Si alloy with additive phase

LI Bin; XU Qingyan; LIU Baicheng

Key Laboratory for Advanced Materials Processing Technology; Ministry of Education of China; Department of Mechanical Engineering; Tsinghua University; Beijing 100084

李斌; 许庆彦; 柳百成 . 有外加相存在时Al-Si合金枝晶微观组织数值模拟[J]. 金属学报, 2007, 43(3): 240-248 .
, , . Numerical simulation of dendrite microstructure for Al-Si alloy with additive phase[J]. Acta Metall Sin, 2007, 43(3): 240-248 .

摘要 参考文献 相关文章 Metrics 全文: PDF(1123 KB)   摘要: 对有外加SiC颗粒（SiCp）时的Al-7.0%Si（质量分数）合金熔体凝固过程中球状颗粒与枝晶间相互作用以及包含颗粒分布的微观组织形成过程进行了模拟研究，在热、溶质守恒的基础上考虑了溶质再分布、界面曲率以及各向异性的影响，分别对颗粒、固相、液相以及固/液界面进行处理，建立了单个及多个颗粒与枝晶相互作用的数值模型，预测了单个颗粒与凝固界面之间的吞并/推移现象，并研究了颗粒附近枝晶生长的溶质、速度场分布以及界面形状，再现了多颗粒与多枝晶相互作用直至最终偏聚到枝晶间的过程。模拟结果表明，颗粒被推移时颗粒与界面的相互作用是一个非稳态的过程，但是在凝固速率较低的条件下可以按照稳态推移的模式进行处理。模拟得到的颗粒分布及微观组织与实验结果吻合较好。 关键词 ： 颗粒推移,  枝晶生长,  微观组织     Abstract：The interaction between spherical particles and dendrites and the process of microstructure formation including particle distribution for Al-7.0%Si (mass fraction) alloy with additive SiC particles were simulated. Based on heat and solute conservation, solute redistribution, interface curvature and anisotropy were considered. Particle, solid, liquid as well as solid/liquid interface were treated respectively. The numerical models that describe the interaction between single particle/multiple particles and dendrites were established. The engulfment/pushing phenomena between single particle and solidification interface were predicted, and solute concentration and velocity field distribution of the growing dendrites and solid/liquid interface shape close to particle were studied. The interaction process between multiple particles and dendrites and the segregation of particles into the interdendrite regions were recurred. The simulated results show that the interaction between particles and advancing curved solid/liquid interfaces is non-steady state when the particle is pushed, while it can be treated as steady pushing mode when solidification velocity is lower than critical velocity. The simulated results of dendrite microstructure and particle distribution are in good agreement with the experimental. Key words： particle pushing    dendritic growth    microstructure 收稿日期: 2006-07-18      ZTFLH:  TG244   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 李斌 许庆彦 柳百成 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2007/V43/I3/240 [1]Jung C K,Jung S W,Nam H W,Han K S.J Compos Mater,2003;37:503 [2]Li B,Xu Q Y,Li X D,Liu B C.Acta Metall Sin,2005; 41:1303 (李斌,许庆彦,李旭东,柳百成．金属学报．2005;12:1303) [3]Li B,Xu Q Y,Li X D,Liu B C.ISIJ Int,2006;46:241 [4]Li B,Xu Q Y,Li X D,Liu B C.Acta Metall Sin,2006; 42:875 (李斌,许庆彦,李旭东,柳百成．金属学报,2006;42:875) [5]Nastac L.Acta Mater,1999;47:4253 [6]Zhu M F,Hong C P.ISIJ Int,2001;41:436 [7]Zhu M F,Hong C P.Metall Mater Trans,2004;35A:1555 [8]Beltran-Sanchez L,Stefanescu D M.Metall Mater Trans, 2003;34A:367 [9]Li Q,Li D Z,Qian B N.Acta Metall Sin,2004;40:634 (李强,李殿中,钱百年．金属学报．2004;40:634) [10]Kim J K,Rohatgi P K.Acta Mater,1998;46:1115 [11]Kim J K,Rohatgi P K.Metall Mater Trans,1998;29A: 351 [12]Stefanescu D M,Juretzko F R,Dhindaw B K,Catalina A V,Sen S,Curreri P A.Metall Mater Trans,1998;29A: 1697 [13]Catalina A V,Mukherjee S,Stefanescu D M.Metall Mater Trans,2000;31A:2559 [14]Dilthey U,Pavlik V.In:Thomas B G,Beckermann C,ed.,Proc 8th Int Conf on Modeling of Casting and Welding Processes,Warrendale,PA:TMS,1998:589 [15]Sasikumar R,Sreenivisan R.Acta Mater,1994;42:2381 [16]Stefanescu D M,Dhindaw B K,Kacar S A,Moitra A. 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