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研究了Al Mg Si合金的凝固过程 ,用不同方法测量了合金成分与冷却速度对该合金系铸态组织的影响。通过形态分析确定了Al Mg Si合金的凝固顺序 ,用EPMA测定了非平衡过程的溶质分布 ,并发现FeSiAl4～ 5相成分在高冷速时为FeSiAl5,而在低冷速时为FeSiAl4。晶界附近发现了无溶质带 (NSZ) ,并从固态扩散和凝固溶质再分配两个方面分析了NSZ的形成原因。
The solidification process of Al Mg Si alloy was studied. The effects of alloy composition and cooling rate on the as-cast microstructure of the alloy were measured by different methods. The order of solidification of Al Mg Si alloy was determined by morphological analysis. The solute distribution of the non-equilibrium process was determined by EPMA. The composition of FeSiAl 4 ~ 5 phase was found to be FeSiAl5 at high cooling rate and FeSiAl4 at low cooling rate. Solute zone (NSZ) was found near the grain boundaries and the formation of NSZ was analyzed from two aspects of solid state diffusion and solidification solute redistribution.