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Dissolution kinetics of primary silicon for hypereutectic Al-Si alloy

ZHANG Rong, CAO Qiu fang, PANG Shu xian, LIU Lin Department of Applied Physics, Northwestern Polytechnical University, Xi′an 710072, P.R.China  
As well known, coarse primary silicon phase in Al Si hypereutectic alloy dents its mechanical properties, thus limits the application of this alloy. In addition, it has been found that primary silicon in Al Si hypereutectic alloys was of higher chemical stability in the melt, and its dissolution behavior had directly influence on the freezing microstructure and on the mechanical properties of the alloy. From above, investigating on dissolution character for primary silicon is very emergent. Therefore, the dissolution process of primary silicon particles in Al 18%Si (mass fraction) alloy was studied both by melt overheating experiment and by theoretical analysis, and a dissolution model of primary silicon in the melt was established based on the atomic diffusion and taken account of interface reaction; the results show that the theoretic curve agrees with the experiment one at overheating temperature of 1 100 ℃.
【CateGory Index】: TG146.2
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