Modelling of dendritic growth under forced convection in solidification of Al-7Si alloy

被引：5

作者：

Liu, D. -R. ^{[1
]}

Guo, E. J. ^{[1
]}

Wang, L. P. ^{[1
]}

Kang, F. W. ^{[1
]}

Lan, Q. ^{[2
]}

机构：

[1] Harbin Univ Sci & Technol, Sch Mat Sci & Engn, Harbin 150040, Peoples R China

[2] Guangxi Univ Natl, Sch Phys & Elect Engn, Nanning 530006, Peoples R China

来源：

INTERNATIONAL JOURNAL OF CAST METALS RESEARCH | 2007年 / 20卷 / 05期

关键词：

dendritic growth; forced convection; computer simulation; semisolid metal processing;

D O I：

10.1179/136404607X268085

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

An integrated microscale model is used to describe the dendritic growth morphology of Al-7Si alloy under forced convection, which combines the two-dimensional finite difference method (FDM) with the cellular automaton (CA) model. The FDM is used to simulate the induced fluid flow and solute transfer. The CA model is used to depict the dendritic morphology. Simulations are performed to investigate the influences of processing variables on morphological evolution under stirring. Calculated results reveal that at the intermediate undercooling, the growth morphology changes from dendritic to rosette as the rotation speed increases. The dendritic growth is promoted by increasing the undercooling. The rotation speed has a minor influence on microstructure formation for the cases of lower and higher undercoolings. A globulitic structure is formed as the nucleation density is increased. Changing the rotation speed is found to have a negligible influence on morphological evolution for the grain refined alloy.

引用

页码：254 / 264

页数：11

共 22 条

[11] Evolution of particle morphology in semisolid processing [J].

Martinez, RA ;

Flemings, MC .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2005, 36A (08) :2205-2210

[12] Meso-scale simulation of grain nucleation, growth and interaction in castings [J].

Mc Fadden, S. ;

Browne, D. J. .

SCRIPTA MATERIALIA, 2006, 55 (10) :847-850

[13] Growth induced dendritic bending and rosette formation during solidification in a shearing flow [J].

Mullis, AM .

ACTA MATERIALIA, 1999, 47 (06) :1783-1789

[14] Creation of semisolid slurries containing fine and spherical particles by grain refinement based on the Mullins-Sekerka stability criterion [J].

Qian, Ma .

ACTA MATERIALIA, 2006, 54 (08) :2241-2252

[15] A lattice Boltzmann study of the effect of stirring on the migration rate of a curved interface in binary slurries [J].

Qin, Rongshan ;

Zhang, Yonghao .

COMPUTERS & FLUIDS, 2006, 35 (8-9) :929-933

[16] Phase-field simulation of semisolid metal processing under conditions of laminar and turbulent flow [J].

Qin, RS ;

Wallach, ER .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 357 (1-2) :45-54

[17] Modeling of dendritic growth with convection using a modified cellular automaton model with a diffuse interface [J].

Shin, YH ;

Hong, CP .

ISIJ INTERNATIONAL, 2002, 42 (04) :359-367

[18] Directional solidification microstructures in diffusive and convective regimes [J].

Trivedi, R ;

Miyahara, H ;

Mazumder, P ;

Simsek, E ;

Tewari, SN .

JOURNAL OF CRYSTAL GROWTH, 2001, 222 (1-2) :365-379

[19] A model of growth morphology for semi-solid metals [J].

Wu, SS ;

Wu, XP ;

Xiao, ZH .

ACTA MATERIALIA, 2004, 52 (12) :3519-3524

[20] Virtual front tracking model for the quantitative modeling of dendritic growth in solidification of alloys [J].

Zhu, M. F. ;

Stefanescu, D. M. .

ACTA MATERIALIA, 2007, 55 (05) :1741-1755

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