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| 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 |
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Cite this article:
LI Bin; XU Qingyan; LIU Baicheng. Numerical simulation of dendrite microstructure for Al-Si alloy with additive phase. Acta Metall Sin, 2007, 43(3): 240-248 .
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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.
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Received: 18 July 2006
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