3D MICROSTRUCTURE SIMULATION OF Al-Si/SiCp COMPOSITES FOR STIR CASTING

Acta Metall Sin

2006, Vol. 42

Issue (8): 875-881 DOI:

Research Articles

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3D MICROSTRUCTURE SIMULATION OF Al-Si/SiCp COMPOSITES FOR STIR CASTING

Bin Li;Qingyan Xu;;

清华大学机械工程系

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Bin Li; Qingyan Xu. 3D MICROSTRUCTURE SIMULATION OF Al-Si/SiCp COMPOSITES FOR STIR CASTING. Acta Metall Sin, 2006, 42(8): 875-881 .

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Abstract The microstructure of SiC particle reinforced Al-7.0%Si (mass fraction) composite made by stir casting was simulated by a modified cellular automaton method coupled with finite difference method and three-dimensional mathematical and numerical models under normal solidification condition were established including macro heat transfer, nucleation, equiaxed dendrite growth and particle pushing. The effects of different particle volume fractions on macro heat transfer, composite microstructure and particle distribution were studied. The simulated results can clearly show the evolution of the microstructure of composite and particle clustering phenomena caused by particle pushing. The simulated results are in good agreement with the experimental. With the increase of SiC particle volume fraction, solidification time is decreased. At the same time, composite matrix grains are refined and particles are distributed more uniform.

Key words: stir casting metal matrix composite solidification microstructure numerical simulation

Received: 08 November 2005

ZTFLH:

TG244.3

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I8/875

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