Interactions of particles with solidifying front in Al2O3P/Al-Si composites
来源期刊：中国有色金属学报(英文版)1999年第3期
论文作者：吴树森 黄乃瑜 安萍
文章页码：524 - 529
Key words：metallic matrix composites; solidification; particle size distribution
Abstract: The behavior of ceramic particles at the solid/liquid interface and the distribution of particles in metallic matrix composites was studied with a zone unidirectional solidification method. Two kinds of partice dispersed composites, Al2O3P/Al-12.6%Si-Sr and Al2O3P/Al-12.6%Si-Sr-Ca containing Al2O3 particles in volume fraction 2%~5% were used. In the Al2O3P/Al-Si-Sr composites, the particles were pushed by the solidifying front, and did not uniformly distribute in the solid. But in the Al2O3P/Al-Si-Sr-Ca composites, the particles were engulfed by the solidifying front and uniformly distributed in the solid. The particles engulfing into the solid was realized only by Sr and Ca addition at the same time. As the interfacial energy between solid and particle was decreased in this case, the Al2O3 particles acted as the substrates of heterogeneous nucleation for the Si phases, which made the particles to be engulfed.
