Simulation on microstructure evolution of Al-Si alloy under effect of natural convection during solidification

被引：11

作者：

Wang, Zhen-hong ^{[1
,2
]}

Zhang, Li-tong ^{[1
]}

Su, Bin ^{[2
]}

Zhang, Xiao-peng ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Peoples R China

[2] China Acad Engn Phys, Inst Mat, Jiangyou 621908, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2022年 / 32卷 / 01期

基金：

国家重点研发计划;

关键词：

Al-Si alloy; solidification microstructure; natural convection; phase-field simulation; DENDRITE GROWTH; FORCED-FLOW; PHASE; SILICON;

D O I：

10.1016/S1003-6326(21)65779-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The solidification microstructure of Al-Si alloy was observed in the experiment, the second dendrite arm spacing (SDAS) was measured, and the effect of temperature on the microstructure was analyzed. Phase-field (PF) model incorporating natural convection caused by gravity was employed to simulate the microstructure evolution of Al-Si alloy under the experimental conditions. Good agreements between the experimental and simulation results verified the reliability of the simulation approach proposed in this study. Based on the proposed model, a series of simulation cases (2D and 3D) were performed to investigate the evolution of columnar and equiaxed dendritic structures. It was found that the solute content of the alloy had little impact on the microstructure evolution, while the solute expansion coefficient had obvious effect on the dendrite tip velocities. Significant improvement of computational efficiency was achieved via novel algorithms, making it possible to perform massive simulation for studying the evolution of solidification microstructures, which is hard to be directly observed in experiments via synchrotron radiation for Al-Si alloy.

引用

页码：79 / 90

页数：12

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